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Hi Ken, and welcome!
As Mike says above, adding a spacer nearly as thick as the plate thickness would be a good shout to start with.
With the exception of something being impossible, most folk in here would definitely fall on the side of 'Do!' rather than 'don't'
Given the recent addition to the Chroma lineup, perhaps @stevelmx5 has some thoughts on this?
Hi @Kenneth Ness, welcome to the best part of Talk Photography
As above, I own/design/build Chroma Cameras, as well as the new ChromaGraphica double dry plate holders. The earlier advice about using sheet film in glass plate holders is spot on. All you're doing is ensuring that the light sensitive face of the film sheet is in the same position as the light sensitive face of the original glass plates. Any material that's thick enough, and rigid enough, to push the sheet of film against the underside of the rails on each side of the holder (beneath the dark slide) and keep it flat will be fine. The glass plates that my holders are designed for are 1.3mm thick, so the entire channel is 2mm thick with springs below. I'd assume that your holders were designed for the same, or similar, thickness glass plates.
With regards to different holder compatibility, you should be able to use any 4x5 standard sheet film holder, not just MPP brand, if you'd rather not have to use a spacer in your glass plate holders.