Theratapper Reverse Engineering and Enhancement

There is a commercial device called a Theratapper which is attached to two hand vibration units via a cable. See here: https://theratapperinc.com/product/theratapper/ The controller regulates speed, intensity etc, and outputs via a stereo cable, which splits into two mono cables, and the hand vibrators then buzz, adjusted accordingly. I want to make a much better version than this. I have a pair of the buzzers and want to reverse engineer them, first to be able to produce a better, lighter version, to then be attached via bluetooth, to an esp32 unit which I am designing for myself, and which will also include audio and visual emdr stimuli. I haven't taken the tappers apart and I want someone to do this, (I can send a pair), produce a circuit diagram, and optionally improve on the design, adding bluetooth functionality.