

If you’re up for pgp and git, gnu password store is a killer app. There are a few guis, including Android and iOS, and if you use gopass there’s a nice plugin for browsers as well. And it’s ultimately just two tools that are both solid and generally well known.
They can’t really break compatibility though. Because the keys are baked into the hardware and the rest of the hardware is, well, hard. Unless you’re talking about Switch 2, which would of course work for Switch 2 games.