Yes it is.

It will probably be something similar to ios altstore. You would have an app which has a list of your non-playstore apps and repo for their releases and would notify you for upgrades that you would manually have to install (for example I suppose obtainium will implement adb), the setup will be annoying but far far less cumbersome than apple where you have to reboot your device multiple times self sign ipas and refresh once a week otherwise the apps don't load at all. This iOS experience is awful but still doable and non-dev. Android will have a better experience for sure.