This https://www.xda-developers.com/efidroid-is-a-second-stage-bootloader/ looks really cool. In short it's a different way of doing multi boot, so you can do it with basically any ROM, without needing to patch them or their kernel, and it installs with one click. (We would just need a dev to port it 
, in his words "Somebody who owns the device has to port it(it's pretty easy though).", and "well if there aren't any problems then even your grandma should be able to port it 
https://github.com/efidroid/projectmanagement/wiki/[EFIDroid]-Porting-a-new-device
if there are, just come visit on slack and I'll help you out.")
, in his words "Somebody who owns the device has to port it(it's pretty easy though).", and "well if there aren't any problems then even your grandma should be able to port it https://github.com/efidroid/projectmanagement/wiki/[EFIDroid]-Porting-a-new-device
if there are, just come visit on slack and I'll help you out.")
