Just to encourage you, I have seen single developers taking on that path for profit or fun (or both XD)
As for "how to install", you can write a guide to spare you any possible/future problem
And regarding updating towards androids versions... Yeah, that's the one thing I can't really advise about.
Ultimetely I'm just a Android player, not a developer and I might be oblivious to the hardship one actually has to face
It's just that... Many ended up sad with this game vanishing from Playstore, and from no fault of yours at all (yes, I'm well aware of the censorship wave -.-) So how would they react with this game returning to Android Platform?
"That's the question"