There is a Nova launcher beta: https://novalauncher.com/beta

I doubt it - the bootloader is very different on iPads and I don’t think it would let you boot a different OS

Only if the hash function is designed well

Do you have any aircon companies that you do recommend?

For a launcher, I’ve been using Neo Launcher (which is on IzzyOnDroid). It’s not as feature full as Nova but it’s pretty similar in spirit and style