The front end elements of these (Theme Components are 100% front end) are written in EmberJS and use the JavaScript API of Discourse
You will almost certainly cut yourself off from all those customisations.
No, but pretty useless without the front end changes.
See my post:
(The Topic is linked above)
Basically great fun for a project I’m sure but totally doesn’t make any economic nor much technical sense.
If you want to deploy on app stores there is a much better option