People are already doing this regularly with montipora's, its called 'grafting', as in grafting 2 corals together. You can google images of grafted monti's, and can likely buy some locally, they are pretty common.
I've seen a few other grafted digitata's.
Somewhere on this forum is a really neat thread of someone that grafted 2 scolies together, that was cool.
So people are experimenting with this already, I think we'll see much more grafted corals in the future.