Coboot Android on Gemini PDA?

As far as I understood the original posting, @inte didn't ask for a dual-boot solution where you have only one environment active. Instead he asked to run one environment on a virtual environment as a 'child' of the 'main' environment. This has the advantage that you can have both environments active at the same time and switch between Android apps and Sailfish apps without a reboot.

AFAIA dual boot on Gemini PDA was available from day 1.

Yes, exactely, dual boot is working. The trick would be to start an Android instance from within SailfishOS in order to run native android apps from the android partition under SailfishOS without restarting the device in Android mode. I guess this thought is somewhat obvious for virtually any dual boot setup so I can hardly believe nobody ever came up with this. At least I couldn't find a similar discussion elsewhere...

Essentially this is what AlienDalvik does for Android-8 emulation. It runs in a LXC-Container which is some kind of separation from the host system. VirtualBox is probably even stricter in the separation as its guest systems even run their own kernel but still there's a analogy of your suggestion and the way how Jolla does it for the official way.

Actually I think it should be possible to run qemu on a Gemini PDA and execute some kind of Android emulation that is available on the desktop, one of the obstacles is probably wayland.

IIRC it was mentioned in one of the previous community collaboration meeting that Jolla is considering on how to make AlienDalvik available for community ports. However it wasn't promised that there will be any kind of offer.

Thats pretty interesting. However I have not even figured out how to access the Android partition from SfOS which was pretty much the first step to realize such kind of "emulation". I'm not sure if qemu is needed at all since there is no need to emulate a different architecture. Alien Dalvik 8 works great on my XA2, but I wouldn't mind if there was a possibility to boot the android installed on my gemini as a sailfish subprocess too, since it is there anyways... (and there are ways to overcome root detection methods of some banking or streaming apps which do not exist on SailfishOS/AD).