Miles, How about something like this?
Pump was less than $20 from Jeff's website, the shark-bite fittings cost more than the pump actually. Cutting the pex did make me wince on the first cut, but the world didn't end, and it all went back together without leaking. If you use shark-bite make sure your cut ends are perfectly straight, not at an angle or they won't seat and seal correctly.
Profdant, watch out that hot water doesn't soften that vinyl tubing so much that it slips off the fittings. I believe that clear stuff is only rated for 75F, don't know if it leaches chemicals into hot water, or just the softening thing.
