So I've bought this:
It is a Viair 485C and is capable of 200psi at a flow rate of 25l/min and a 100% duty cycle.
It's also supposed to be quiet according to their website (it isn't, not compared to the standard compressor anyway).
Should be good, if I can make it fit that is:
I'll need to redesign a complete new mounting and housing for the compressor and the valve block. Fun!