9x12 bags magazine - do they exist?

Now that I got my 9x12 Gorlitz Atelier Prima reflex camera working, I am wondering if there exists a 9x12 bags magazine so I can shoot 12 sheets of film in one go. This will be used for handheld portraits.

I already have a few Kodak branded 9x12 thin metal film holders, buy they are a bit slow to change. And their dark slides tend to be difficult to remove and insert.

For the 3x4 Graflex RB Super D series, there are lots of bag mags on eBay for quite low price. But I haven't seen any for 9x12, thus the question.

Adam Dau at SK Grimes, may be able to make one up for you. https://skgrimes.com/


Hope this helps.

Rod

Another potential option is an adapter to mount a 3x4 bag mag to your 9x12 camera, though this might also require adjusting the focus scale and ground glass position (I don't know what the film setback in a bag mag is). IMO, it would be within the capability of a home shop, though, and would give you an option between Graflex mount and Graflok (at the time of build).