I think you'll find that the Vogitar lens was the cheapest available on the Voightlander cameras and quite basic, all the various manufacturers offered a range of 9x12 cameras with a variety of shutters and lenses.

Your 105mm Novar might fit but it certainly won't cover 9x12. I have a modern coated 105mm Rodenstock Trinar (similar to the Novar) and I tried that on a 9x12 & 5x4 and it certainly doesn't cover either format.

There are plenty of links to making your own glass screen, but to convert to 5x4 you need to make an adaptor which holds 5x4 darkslides, and you'd need to make a matching 5x4 focussing screen.

I think you'd find a much better lens/shutter without to much effort or cost, and 9x12 holder try placing a wanted advert here on APUG. Look in the Plate camera sub forum I've written a page showing some of the variations of Plate/film holders I've got.

Ian