Had been waiting for my pi 5 argon case which got lost in the post before I could set this up. Ive been tinkering with an old SFF PC running arch over the last few months to get a "smart tv" set up going that im happy with, now ive condensed it down into a little debian box that uses a fraction of the electricity. Happy days.
I have not tried running a browser in kodi. I only use the pi as a smart tv and the remote isnt great for typing. I use youtube, twitch and plex so far. It has tons of plugins (apps so to speak) which I dont use so atm I dont bother.
Feel free to update if you find out more.