I have the DJI set for other purposes, not sure I'd be plugging them into PA or trying to use them in a venue. {...}
For a non-audience-facing application like a talkback mic it'd probably fine, just as long as the OP doesn't expect to use it much after the house opens. I was going to suggest an Xvive plug-on transmitter (also 2.4 GHz) because it's cheap, it won't interfere with anything show-critical (assuming the tablet is running 5GHz Wi-Fi, anyway), and because it fails to silent (which—for a talkback mic—means that the absolute-worst-case scenario is going to be some vigorous arm-waving and shouting).
-Russ