A bit late, since you finished it already, but for the record, the browser does seem to have some interesting capabilities, like Server Sent Events:
https://www.mobileread.com/forums/sh...d.php?t=330150
Just a couple of the interesting browser-based ideas:
https://www.mobileread.com/forums/sh...d.php?t=262353
https://www.mobileread.com/forums/sh...d.php?t=348950
Websockets and canvas sharing on the Kobo browser:
Live Kobo Drawing Sync to Desktop via Browser
https://www.mobileread.com/forums/sh...d.php?t=356361
benkaiser/kobo-whiteboard
https://github.com/benkaiser/kobo-whiteboard
benkaiser/web-share-images
https://github.com/benkaiser/web-sha...hareCanvas.tsx
I don't like the stock browser much either, especially the scrolling action, though there is always elinks for a classic text-based browser option.
https://www.mobileread.com/forums/sh...91&postcount=3
(Not to mention netsurf in a chroot or InkBox, for those willing to go the "extra mile".)