Robert, you're making it more difficult than it needs to be. Get a Crown Graphic form ebay. Not the 4x5 version, but the 2x3 version. The 6x9 holders should fit. If not, 2x3 holders are readily available. Put the holga lens/shutter assembly onto the camera lens board. It's that simple. The bed should drop down to prevent it from getting in the image area since it is a wide lens. You should be set.

-Greg