There is Anbox[0] for running Android applications under Linux, and I've heard some people claim it's "less clunky" then an AVD. I haven't yet tried it myself but will soon.

I don't disagree that there are some suboptimal things about Android but to bootstrap a new mobile OS platform from almost nothing, and being on-par not even matching Android especially with regards to security (sandboxing, a proper permission model) seems like it would require a dedicated team several years of development time, which Purism doesn't have.

[0]: https://anbox.io/