Hi Sam,
You may want to look at the QHY5L-ii, it has the same form factor (e.g. 1.25" barrel) as the lodestar. The QHY5L-ii and the ZWO 120mm have the same cmos chip (I do not know it they have similar performance, although I would think they 'should').
You may find this thread on CN interesting,
Detailed Lodestar vs. QHY5L-ii study. Someone mention that it works with Maxim as well.
I am using it as a OAG on my c9.25HD and it works great.
cheers,
Bram