Do you think it would be possible for the importer to archive
https://www.patreon.com/file?h= links in post text? As far as i know, the importer does replace post links in post text for kemono ones, so there is some degree of parsing is already there.
Because right now, this is an excellent way to evade the importer. Instead of attaching the file directly, you just post the link to it, and the importer never picks it up.
A bright example would be
https://kemono.su/patreon/user/16010661