nilsenils You can't remove the Browser but you can Disable it (I haven't tested what happens if you do however I'm going to be testing some things on my non daily driver later so will report back), GrapheneOS has a Black and White filter in Accessibility settings too.
Any app from the Play Store should work fine alongside our sandboxed play services compatibility layer. Graphene offers 95% broad app compatibility, with the outlying 5% being made up of unknowns, apps suffering memory corruption and banking apps et al that require full safetynet basicintegrity and ctsprofilematch passes.
Give it a go you won't be disappointed and you've got a well resourced and knowledgeable community to reach out to for any help you need. GrapheneOS is for everyone.
Any further questions don't hesitate, fire away we're ready to help.
UPDATE: Having tested disabling Vanadium (Browser) on my Pixel 3 test device it's safe to say it is possible but just take on board the warning message it throws when disabling it.