I bought a Planck specifically to answer this question. Unfortunately, it has a significantly bigger footprint than a vortex core, so it would be difficult.
That’s too bad. I’ve been hoping the keyboard could be swapped out with something running QMK, but I’ve also been searching for a low-profile, Bluetooth Planck and realize there actually isn’t that much variety out there.
That's surprising. From the photo's top row, it looks like the Lisperati's keyboard is a key wider than the 12x4 Planck. Does the Vortex use smaller caps?