For the keyboard I would try Florisboard on f-droid, it gives a lot more spacing and sizing options. I basically make the keys as wide as possible and then play with key height. The bottom offset let’s you raise or lower the keyboard as a whole to suit your grip.

I was a long time AnySoftkeyBoard user until a year or two ago when I finally decided Floris was just better. I’ve tried FUTO keyboard a little bit, it seemed fine but didn’t offer enough customization options.

Calyx has you relock the bootloader similar to graphene so it shouldn’t flag as rooted.

Not exactly the same situation but I’ve noticed that Chrome has moved from only being virtually unusable with my VPN running, to actually unusable. It just refuses to resolve URLs and won’t search, previously it just gave tons of Captcha popups if I tried to do anything. Honestly at this point I’ve just accepted I have to make firefox based browsers work for everything from now on.