I can state that the idea of processing film in the Paterson Orbital was never suggested. It just goes to show what an inventive lot you large-format users are!
My first thought today, when starting to read the point about film sticking to the bottom, was whether a series of small bumps would avoid the partial vacuum under the sheet but I then read on to see that you've already sussed it. I think the use of blobs of hot-melt glue is genius and we could have done with your brain at Paterson! My concern would be that any texture mustn't cause scratches on the back of the film. I wonder, though, if it really matters if the film does stick. It certainly doesn't matter with prints and the only issue is if solution is retained around the paper or film and causes contamination of the next solution.