I've been working on building a wireless MPE MIDI keyboard using HE switches (Akko Astrolinks currently, experimenting with spring weights). The video is actually running over Bluetooth, cable is just supplying power cause the board doesn't have a battery yet.

The hall effect sensors give continuous position tracking through the full key travel, which I'm using for per-key channel pressure over MPE. Curious whether any of you make music alongside your keyboard hobby and whether something like this would actually fit into your setup.