Tiny Feather Worms, 360 'round the rock

More hitch hikers, this time, about 9+ mini feather worms on a 4 inch rock. the upper side of the rock has four and a baby clam, though the underside of the rock (clear of any growth or color) has atleast 5 worms. I have the rock perched precariously atop the peaks of more pointy rocks so that the worms can come out to feed.
Is there any way I can coax these guys to move so that I can integrate this rock as part of my reef, or will it forever stay the odd ball? they look like single tier versions of my large one I have (not babies of it though), about how long would it take with ample feeding to get them to outgrow their pinhole spots they are in now.
I was even thinking of half burying the rock in the sand, leaving just enough room for an annoyed worm to relocate.

 

the clam is a neat thing, but in my opinion just put the rock in place because most rocks/corals you buy will have the tiny feather dusters on them

 

I have Florida Aquacultured Rock that has everything but the kitchen sink. Heck I've got oysters, clams, feathers, ricordia, sponges, odd looking corals you name it. It's part of the ocean and looks fine to me.

 

I want to keep them, not smother them, thats why I posted. Especially a purple one on the bottom, he's grown alot in the last 3 weeks