That is a great idea.
I think any chilling device will work as long as the tubing is able to transfer the heat efficiently.
I can tell you none of these ideas will work with plastic tubing (been there, done that
).
A thought I had is if you used aluminum tubing (yeah, I know it will be eaten... but not for a long time) and threaded the ends using a pipe threader (had some done for free at Home Depot once
), you could use elbows and couplers available here:
http://www.metalsalesusa.com/fitt.htm
and easily make heat transfer manifold. Only the parts in the tank, and at the chiller need to be metal... you could plumb it to and from with PVC.