Thought I’d share my experience with gelatin fining through a brett pelicle. I just bottled two batches of Saison with Brett last night. Both had a nice classic brett pelicle. A few days ago I chilled them to o 30F, then pitched my typical 150F cup of gelatin right through the pelicle. I gave each fermenter a little 2 second rocking to get the gelatin spread out. Then it rested at 30F for a few days till I bottled. On bottling day the pelicles appeared totally unaffected. And the beer beneath was nice and clear as expected from the gelatin.
So, gelatin does its job. Pelicle does its job.