It works. Project completed.
A remote control based on a PTR9618PA, which is a Tx power amplified nRF52832. It features:
If powered through VCC1, the remote will be continually powered (though it can sleep if so desired). If, instead, it is powered through VCC2, then power will be delivered to the module only when either of the normally-open buttons is pressed, and power will be removed when the button is released. The rest of the time power will be 100% cut-off, to maximize energy savings.
For ease of programming and debugging, the breakout incorporates a 10-pin IDC connector.
To receive serial output from the module, you can use use this adapter: https://www.openhardware.io/view/484/IDC-10-pin-ARM-debug-adapter