There's a shop in Smithers that carries Paradigm\Anthem.
Has been there forever might be easier to get compared to a trip all the way here again.

With your set up they should know you only need a four channel for the atmos. channels? Surprising the guy knew of AXIOM so I would think they know the XMC-1 is a pre\pro.? If that 4 channel plays nice is a whole other ball game though.