That's basically what was at the top of the cannisters. Foam filter material that disintegrated.
Probably could put an in-line filter in bowl vent - eventually it will probably plug up. Some of the finer charcoal dust will probably migrate through eventually.
But what about the fuel tank vent lines? Probably not as much of airflow that way, but ....
It wasn't that hard to cut open the ones on the jeeps.
Hardest part was the figuring out what materials to use for the foam and the purge diagphram.