@SafeguardingResearch Holy cow, this blew up. Thanks for your attention, lovely people of the fediverse.
If you want to reproduce what I did, here's a rough guide:
1) Grab an old PC / Laptop / Raspberry pi, whatever you have lying around. If it has a network connection and some storage, it's probably fine.
2) Install Linux on it. Ubuntu is fine most of the time. I used Ubuntu server following this guide: https://ubuntu.com/tutorials/install-ubuntu-server#1-overview