Well, just discover how model was passed to the showModal function and it unlocked a tons of things in my head 
Now I’m quite happy with what I have and assume it’s properly implemented according to core guidelines.
<script type="text/javascript" src="https://cf.eve-oj.com/js/EVEoj-0.3.x.min.js"></script>
<script type="text/javascript">
var SDEVer = 201611140,
SDD = EVEoj.SDD.Create('json', {'path': 'https://cf.eve-oj.com/sdd/' + SDEVer});
</script>
<script type="text/x-handlebars" data-template-name="modal/eve-sde-modal">
{{#d-modal-body title="eve_sde_modal_title" class="eve-sde-modal"}}
<p data-typeid="{{ model.type_id }}">{{{ model.description }}}</p>
{{#if model.attributes.shield }}
<h4>Shield</h4>
<table>
<tbody>
<tr>
{{#each model.attributes.shield as |attribute|}}
<td>
<img src="{{ attribute.img.src }}" alt="{{ attribute.img.alt }}" /> {{ attribute.value }}
</td>
{{/each}}
</tr>
</tbody>
</table>
{{/if}}
{{#if model.attributes.shield }}
<h4>Armor</h4>
<table>
<tbody>
<tr>
{{#each model.attributes.armor as |attribute|}}
<td>
<img src="{{ attribute.img.src }}" alt="{{ attribute.img.alt }}" /> {{ attribute.value }}
</td>
{{/each}}
</tr>
</tbody>
</table>
{{/if}}
{{#if model.attributes.shield }}
<h4>Hull</h4>
<table>
<tbody>
<tr>
{{#each model.attributes.hull as |attribute|}}
<td>
<img src="{{ attribute.img.src }}" alt="{{ attribute.img.alt }}" /> {{ attribute.value }}
</td>
{{/each}}
</tr>
</tbody>
</table>
{{/if}}
{{/d-modal-body}}
</script>
<script type="text/discourse-plugin" version="0.8.24">
const ESI_BASE_URI = 'https://esi.evetech.net';
const RESISTS = [109, 110, 111, 113, 267, 268, 269, 270, 271, 272, 273, 274];
const showModal = require('discourse/lib/show-modal').default;
let currentLocale = I18n.currentLocale();
// EvE Online Magic SDE
api.onAppEvent('modal:body-shown', msg => {
if (msg.title !== 'eve_sde_modal_title')
return;
var typeID = $('.modal-body p').attr('data-typeid');
$('.modal-header .title h3 img').remove();
$('.modal-header .title h3').prepend(
$('<img>').attr('src', `//image.eveonline.com/Type/${typeID}_32.png`)
.attr('alt', 'Icon')
.css('margin-right', '10px'));
});
api.decorateCooked(function(cooked) {
SDD.LoadMeta()
.then(function(arg) {
return arg.source.GetTable('invTypes').Load();
})
.then(function(arg) {
cooked.find('a[href="#evesde"]').each(function() {
var typeName = $(this).text();
results = _.filter(arg.table.data, function(entry) {
return entry[arg.table.c.typeName] === typeName;
});
if (results.length > 0) {
$(this).attr('data-typeid', results[0][arg.table.c.typeID]);
$(this).on('click', function() {
var typeID = $(this).attr('data-typeid');
var typeUri = ESI_BASE_URI + '/latest/universe/types/' + typeID + '/';
$.ajax({
data : {
language: 'fr'
},
dataType: 'json',
headers: {
'Accept-Language': 'fr',
'X-User-Agent': 'discourse/1.0.0 (Warlof Tutsimo - Daerie Inc. - Get Off My Lawn)'
},
type: 'GET',
url: typeUri
}).done(function(data) {
SDD.LoadMeta()
.then(function(arg) {
return arg.source.GetTable('dgmAttributeTypes').Load();
})
.then(function(arg) {
var sdeModel = {
'type_id': 0,
'description': '',
'attributes': {
'shield': [],
'armor': [],
'hull': []
}
};
_.each(data.dogma_attributes, function(dgmAttribute) {
if (RESISTS.indexOf(dgmAttribute.attribute_id) >= 0) {
results = _.filter(arg.table.data, function(entry) {
return entry[arg.table.c.attributeID] === dgmAttribute.attribute_id;
});
if (results.length > 0) {
var attribute = {
'id': 0,
'name': '',
'value': '',
'percent': 0,
'img': {
'alt': '',
'src': ''
}
};
switch (results[0][arg.table.c.iconID]) {
case 1393:
attribute.img.src = 'https://forums.clandaerie.com/uploads/default/original/1X/a948a8f3d0ac5a1628c110071aceef976db0fae5.png';
break;
case 1394:
attribute.img.src = 'https://forums.clandaerie.com/uploads/default/original/1X/4d8ef4c39d6baa27845ff8931c63fc4c08cc7bbb.png';
break;
case 1395:
attribute.img.src = 'https://forums.clandaerie.com/uploads/default/original/1X/281dbfadd89530cc1142a4b93fdc7ada671297eb.png';
break;
case 1396:
attribute.img.src = 'https://forums.clandaerie.com/uploads/default/original/1X/b3f1e97f6144ec32c601294bfe2a2abc7cd9adfd.png';
break;
}
attribute.id = dgmAttribute.attribute_id;
attribute.name = results[0][arg.table.c.displayName];
attribute.value = dgmAttribute.value;
attribute.percent = Math.round((1 - attribute.value) * 100);
attribute.img.alt = attribute.name.replace(/Armor|Shield|Structure/gi, '').trim();
switch (results[0][arg.table.c.categoryID]) {
// Shield
case 2:
sdeModel.attributes.shield.push(attribute);
break;
// Armor
case 3:
sdeModel.attributes.armor.push(attribute);
break;
// Structure
case 4:
sdeModel.attributes.hull.push(attribute);
break;
}
}
}
});
sdeModel.type_id = typeID;
sdeModel.description = data.description
.replace(/\r\n/gi, '<br/>')
.replace(/\n\n/gi, '<br/>')
.replace(/\n/gi, '<br/>')
.replace(/<color='0xff([a-f0-9]{6})'>([a-z0-9,.']+)<\/color>/gmi, function(match, p1, p2, offset, string) {
return `<span style="color: #${p1};">${p2}</span>`;
})
.replace(/<a href=showinfo:([0-9]+)>([éèàçù \w]+)<\/a>/gmi, function(match, p1, p2, offset, string) {
return p2;
});
I18n.translations[currentLocale].js.eve_sde_modal_title = data.name;
showModal('eveSdeModal', {
'model': sdeModel
});
});
});
});
}
});
});
}, {onlyStream: true});
</script>