My LDS told me the same-same for an Atomic B2 set-up. They had one in the shop that I wanted but it was in a Yoke Configuration and I wanted DIN; he said he had the conversion in stock and would convert the B2 Yoke to a B2 DIN. I have not seen any technical drawings for this or actually seen it performed, but it sounds reasonable enough.
What I have done is I bought two ScubaPro Mk25s/S600s, one in Yoke and One in DIN (second DIN MK 25 for doubles) and use the long/short hose configuration for my 2nd stages and just use the DIN or Yoke 1st stage as needed. This does involve swapping out 1st stages but I do not mind. I recently purchased an Atomic B2 1st/2nd stage rig in Yoke; I plan to buy a second one in DIN for the same purpose. I will leave one regulator configuration in Yoke and the other one DIN, but carry the non-utilized 1st stages as spares. I know that there are Yoke-to-DIN converters, but I am not wild about adding an additional peice of hardware between my tank valve and 1st stages. When I go douple I have already purchased two MKs 25 in DINs so no issure there either. I want to have two complete sets of good regulators on-hand that I can convert to either Yoke or DIN. I also have my first Sherwood regs that I will deligate to a third spares for recreational OW diving only.