[Phantom Girl bites on her lower lip for a few moments and nods slowly at Fumi's pseudo-explanation. After a few moments, she drifts over to the machine to give it a cursory prod.]

...I'm not being strapped to this thing while you lead monsters of scaling difficulty into the room. Just to clear that up in advance.

[She was sure Fumi had a much better idea than that, anyway.]

I'm thinking you'll need to make a portable version. ...Or you'll need to figure out how Personas awaken and artificially induce the process, but that's kind of chicken and egg, huh?