Cool idea! Does it work well? How good is the "sandboxing"?
Insular: Isolate your Big Brother apps
https://www.f-droid.org/en/packages/com.oasisfeng.island.fdroid/
Discussion
I would say it just works. If I isolate an app requiring GServices to work, I have to make sure that there is an isolated version of GServices too. But I use MicroG.