darkcruix over on the Deskthority project thread posted detailed setup instructions to add up to two LEDs to the new Model F keyboards. https://deskthority.net/viewtopic.php?p=477571#p477571
The xwhatsit controller (whether with xwhatsit or QMK firmware) allows you to have both a solenoid and up to two LEDs at the same time (example: Num Lock and Caps Lock).
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