Fellow trample fan here. Go to your preferred search engine and type in "foot fetish k2s". There you'll find all the paid clips that people uploaded for free - i.e. you pay in download time, not money. Some of them, like Shoesession requires you to create an account before you can view stuff like links and images. Also make sure you got at least one decent script blocker - these sites love their popups.
Unfortunately I haven't been able to locate the same for heel crush, and Youtube used to have an amazing selection back in the day. Rosebudsfeet, Rob Jansen, SnapCrunch, now most of those are just gone. Either because the uploaders got cold feet and didn't tell anyone they were leaving, or the flaggots mercilessly beat their account down. I know one that I used to watch on YT before she moved to Patreon, Kali Alaura, got told her videos of crushing objects in boots was "porn", despite not even bare feet being shown.