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You could make your own with an ESP32 wired to two buttons, then you can customize it exactly as you need it. It shouldn't be too difficult (famous last words, I know) if you use one of the BT HID libraries like https://docs.espressif.com/projects/esp-idf/en/latest/esp32/....

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He'd have to make a package, make the connections solid, etc etc. A fun project but a project onto its own self.

A more boilerplate solution would be to use something like ZMK (or a similar "keyboard") OS. ZMK uses Zephyr RTOS and is quite feature-rich. A macropad should not be very difficult to make. Reddit's r/ergomechkeyboards may be a good starting point.

Does Zephyr support ESP32's? I didn't see it listed on their page. I did see an Arduino variant though.

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