RASA 11 Camera Adapter or Filter Holder Baader or Photon Cage

WANTED

I’m currently stuck in the tar pit of vignetting with my RASA 11.

It images fine using the stock Celestron camera adapter at its default opening, but the vignetting is costing me usable field and I’d really like to reclaim it.

I’m looking for a good used, full replacement for the factory Celestron fitting to connect my camera to the RASA 11.

Baader UFC? Photon Cage? Custom solution? 3D file I can print?

ALSO: I'm on the hunt for a good LPR or filter that would work well with the F/2.2 optics.

I’ve got cash ready - just not enough for a brand-new setup.

Thanks in advance.