ADCs, DACs, IO extenders
These should all work without kernel drivers. For example, here’s a user space python library for ADS1*15 ADCs, or Nuvoton MS51 IO Expanders. Unless you need very specific timing or require the kernel to know about it, you shouldn’t need a kernel driver.
You should only need to add the IP of the last proxy before reaching Jellyfin, which would be Caddy.