You could use a A.T. Astrobee-D, I bought one - haven't built it yet, but am leaning towards a 38 mm mount.
Have a TRF friend locally that recommends that course of action, and the other threads here at TRF - use the search feature - all point to this being a great solution to L1 certing and giving me a larger range of motors to choose from.
So, if you did this, you could easily use your 29mm hardware and still have room for a bigger engine.
Others here certainly will give you even more ideas and recommendations.
Cheers,