I discovered a hypothesis that I’ve never tried works to use MIDI plugins in Podium.
If you use MIDI Yoke or anything like that, you should be able to set the MIDI out of a plugin to one of the Yoke In’s or “Out to MIDI Yoke x” as it’s referred to and setting the MIDI input to the corresponding MIDI Yoke Number (In from MIDI Yoke x). The MIDI sends through to the desired destination plugin.