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It took a minute to find a link to what you're talking about. Doesn't seem to have made it to many of the usual suspect forums yet. Hopefully AF on Pyxis 12K means that the same is coming to Ursa LF sooner rather than later! https://forum.blackmagicdesign.com/viewtopic.php?f=2&t=239482

Well it’s happened! Blackmagic released a beta firmware adding PDAF to the Pyxis 12K. I’ve been playing around with it a bit tonight. It’s really impressive for a first effort. The face detection mode is superb for a standard solo interview. AFC is pretty great but takes a bit to get used to, because it operates a bit differently than my Panasonics. The object tracking mode is its weakest at the moment. That needs some real work. The other nice feature with this update enabling linear focus throws and the ability to set rotation degrees on focus by wire lenses. If this firmware will work with Tilta’s upcoming PL to L adapter, I’ll be veryyyyyyy happy. Going to try it out on an actual shoot tomorrow.

I have experimented with the Beastgrip 1.33x and 1.55x adapters using full frame cameras and wide/normal to short telephoto lenses (35/40/50/75). I have tried with my slow Leica M lenses, which are usually pretty forgiving on coverage. These Anamorphics will cover full frame and are easy enough to attach to the M mount lenses with a 39 to 37 step down ring. the 1.33x is definitely a better fit for the 35 & 40mm lenses, as the 1.55x has a pretty wide FOV. Results are similar to the above samples, with soft edges and major distortion. But definitely plenty of character. Next time I take a stab at it, I'll post some samples.

I also found this video below, which combines a cheap adapter from Aliexpress with 17mm rear-filter and the Viltrox 28mm F4.5 lens. He just sticks the mounting plate from the smartphone clamp for the anamorphic directly onto the Viltrox lens with tape, so hardly and ideal situation, but it is more proof of concept, and it covers FF too! Test image: Video:

Yes, the Beastgrip might well be a better candidate - not only due to having a filter thread I can convert to but also potentially with a larger rear aperture for better coverage! I found this comparison between the Moment M-series (left) and Beastgrip (right) which shows the rear openings: Some rough measurements of the Beastgrip suggest that the rectangular opening is almost exactly 17mm across, which would make the image circle significantly larger than my Neewer, which uses a 17mm threaded mount. The rectangular opening looks to be on a separate plate - I wonder if that could be removed somehow to really open up the rear element? Wow - full frame coverage! I really didn't expect that, and it's very encouraging to hear! I also realised the 1.55x makes everything pretty wide, and have been contemplating what FOVs I'd want to get and what focal length taking lenses I'd need to use to get them. You reminded me of my ultra-cheap Risepray 35mm F1.6 C-mount lens, which has a 37mm filter thread. Assuming it doesn't vignette (and therefore doesn't need any cropping) that would give me a 45mm F2.1 equivalent lens, which would be pretty good for shooting street and run-n-gun like I do.