[greggold]

Great news! Good to hear that it worked as expected.

I also have 2 MATEK ExpressLRS ELRS-R24-V Receiver × 2 (ordered from Drone Parts Garage on 25 Oct 2022 $76 for 2 rxs ).
These offer voltage sensor: "36V Max. battery voltage sense (1K:10K voltage divider built-in), RxBt,Curr,Capa,Bat%,GPS telemetry and VSpd(Vario)". They have 6 sets of PWM, numbered 1,2,3,4,6,7. (I dont know where 5 fits in). But I expect if I connect the balance lead to pin 7 (as described above) this may work to monitor pack voltage. I will check this out.