Fragging or removing encrusting montis?

[Coasting]

I have a few encrusting montis.
Confusa, Orange rainbow, and some pink thing.... (an ID on the pink one would be great...)
Their all, rather quickly, taking over the good real estate on the rock in my tank.
How do I get rid of pieces! How do I frag it with out sawing up my rock?
I just want pieces gone at this point, I don't care what happens to them, im more then happy to just drill holes through them to place new corals on top, but know the new corals would just get covered up. I'm tempted to take a hammer and chisel to it, but knowing my luck I would still end up breaking my rock.

They've all ready been annoying my frogspawn, and even annoyed my RBTA and have forced him to vacate his old home. They need to go!