Hmm… maybe a target to remove the header and sidebar when in an iframe using CSS? Maybe something like (not sure if that’ll work)
iframe > html > body > ... {
display: none;
}
I’ll see if I can get it to work, maybe with some JS 
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@Heliosurge how would you get it to embed it on topics, if there are multiple topics? If I understand correctly, each blog topic is linked to the respective comments topic, in a seperate category. Just curious 
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Why not perhaps uncheck the ‘Create’ permission for those who aren’t blog writers, but leave the ‘Reply’ permission checked, and for blog writers the ‘Create’ checked?