Is there something like a P-clip but with symmetric flanges?
There are 'universal' pipe hangers that you could shape as needed. These are just a strip of malleable metal with a series of holes in it. I'm sure the big box stores have something equivalent.



http://www.mcmaster.com/#perforated-steel-straps/=nrz5k8

Adding some more options:


http://www.mcmaster.com/#pipe-routing-clamps/=nrzgqn