Got my hands on a Behringer X-Touch Mini USB MIDI Controller (Yay for Facebook Marketplace).
Will be using this in my Lightroom editing workflow!

Configuration

Changing the MIDI Mapping

The X-Touch Mini has 12 white buttons. With two layers, that would give us 24 different buttons. However some of the buttons were mapped to the same MIDI control key aka - some buttons are duplicate. So firstly, we’ll need to remap the surface.

• Download the X-Touch Editor app
• Run X-Touch Editor
• Connect the Behringer X-Touch Mini
• Load profiles into the device

I used this preset (thanks Dan!)

MIDI2LR Mapping

• Download MIDI2LR
• Install into Lightroom
• Run MIDI2LR
• Press buttons on the MIDI device. Entries will appear in the MIDI2LR window, where you can assign actions

Wireless Control

-> Buy a MIDI to Bluetooth Adapter

Voila!