You know what I would really love? A custom rom browser.
Imagine it, not a repo, but a site or app that lets you "try out" custom roms through an embedded or emulated interface.
It's such a hassle downloading and installing every rom out there to see how they feel and function, it would be nice to be able to take them out for test drives. I think this could be theoretically possible, several bluestack emulators for the most popular custom roms emulated as an instance of mostly just the lock and home screen with a few dummy apps, kind of like how things are set up in a phone shop.
Unfortunately I'm not quite skilled enough to set something like this up, and I'm sure the server hosting would be a bit of a financial burden but I think this is a cool, albeit, unlikely idea.
this would be... somewhat possible, you can't really boot GSI images, however the folk at BlissOS do have an android generic project that makes porting custom roms to x86 a lot easier. By porting android images to generic x86, we can serve them as temporary VMs, just like https://distrosea.com/ (I've actually been thinking about doing something like this for bliss specifically but funding says no lol).
This is contingent on roms being ported to x86 though, off the top of my head there are images floating around for
Bliss (Obviously)
Lineage OS,
Vanilla AOSP,
and specific verisons of
Project sakura (A11 iirc)
CarbonROM A10
Bootleggers A10
RessurectionRemix
Pixel Experience
Dirty Unicorns
Tesla
I believe there are also images of LMODroid and Calyx floating around... somewhere
Total noob here but wouldn't it be possible to have an ARM device stream the content to your browser? So you got a viewport of a compatible device that shows you how it would look like?
True parity would be impossible without porting it to x86, but that would give you a glimpse if the UX is decent enough