I emailed Mojo last week with the same question, this is the response I had:
Yes you can fit the QR15 lowers onto your forks. The lowers are £149 if you want to fit them yourself and this includes the lowers, axle, seals and decals.
We can also fit them for £129 and that’s on top of a £89 service charge.
:-)
(Didn’t ask about colours though)