You could investigate using a speed graphic , possibly one of the smaller format baby speeds as a shutter body .
Or a whole speed graphic with a monster cone lensboard and support,
“I really like the Kodak/Graphic wooden 5x7 film holders (though I don’t know if you’re talking about the Kodak plate holders which are different.)”
Yes mine are the Folmer Graflex for Eastman Kodak black stained wooden shorter holders , they just work and a bonus is they are lighter than...
Useful note ref using paper, which has encouraged me to buy some more 13x18 holders.
I had resorted to buying 5x7 from the USA as finding that my fidelity 5x7 were actually half plate with the painted size worn off was a pain , luckily I had some excellent condition wooden Kodaks that saved...
Hi , I have not done this myself but I do have a similar problem with rogue 13x18 holders in my 5x7 collection oh and GB half plate which is a worse problem.
So what I suggest is plastic H beam commonly sold to model makers Tamiya make a 3mm H , cut one I off with a sharp craft knife and tape...
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