Attaching large coral colonies?

[Albertan22]

So I've got a bit of an issue. After 3 years in my tank, two pieces of flat rock that make up a bridge and cap rock in my aquascape have deteriorated and disolved and are now breaking up, making my aquascape unstable. I'm on the hunt for some replacement pieces at my LFS's, but these pieces being the top rocks of my aquascape have three large acro colonies attached. Does anyone have suggestions on how to detach these colonies and re-attach them to new rock? We're not talking frags here, the biggest of these colonies is probably 10 inches tall and quite branched. I'm hoping that I don't have to break them up and start from frags again.

I've also been struggling to attach a large hammer coral to my rockwork. The hammer grew to the size of a soccer ball, then one day this summer I brushed it with my arm when cleaning and it broke into 5 pieces. I gave away 4 of the pieces, and have been fighting to get the 5th to re-attach to the rock ever since. I've been trying appoxy with super glue like I use for frags, but it doesn't seem to want to hold the larger piece. Any suggestions?