Let us know what your solution is. I have a 203 Ektar that came back from the shop thoroughly adhered to its lens board. I ended up making a 4" to B&J lens-board adapter, rather than fight it, but that only works if the stuck lens-board is smaller than the alternate camera.

(I can also say that 4 boards for the beast later, that were they still in business, the woodworkers at Deardorff and Co. would have nothing to worry about from me)