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.
I would recommend the BSD 3" Horizon or the LOC/Precision Forte. Both are three inches in diameter and over three feet tall. They can both fly on the F40, F52, G33 and G64 loads. The Forte is cheaper at $45 than the $60 Horizon, but the Horizon has motor retention and to-the-motor-mount fin tabs. But both are made of the same materials. Attached is a picture of my Horizon.
Many Many choices for that one. I would suggest something durable, and very versatile, such as a LOC Graduator. Should fly on any of the loads available for the 29 40-120. Another good choice, would be an AT Initiator, PML Callisto, BSD 3" Horizon. There are so many choices, just about anything 2-3 inch diameter from the mid/ hpr vendors would be a good one.