Disabling auto-connect on Bluetooth hearing aids

I originally posted this a few months ago, but I never quite got a solution. So I’ve rephrased it a little bit and I thought I’d try again.

Some time ago, I began wearing hearing aids. One of their features is that they’re Bluetooth-enabled; this allows connection to a mobile app, and also streaming audio. The sound quality is not that great compared to Bluetooth ear buds, but I use it in high-ambient-noise situations, and besides, my ears are shot anyway — hence the hearing aids. So I’ve paired them to my iMac, my iPad, my iPhone, and to my AppleTV. They basically work well.

The [not so much a problem as a] petty annoyance is that, when I take them out of their charger — which effectively turns them on — my devices connect to them automatically. It even happens if I leave the apartment; when I come back my devices at home (my Apple TV and my iMac) will try to connect to them. So I need to manually disconnect the hearing aids from each device in turn (unless I have a reason otherwise). And with my AppleTV, it connects more-or-less randomly, and I need to manually disconnect through the Settings app. Just deselecting them in the “Audio” section of the Control Center isn’t enough, they will reconnect some apparently random time later.

I don’t see any way of disabling “auto connect“ on any of the devices. I could forget the hearing aids and then re-pair them as needed, but putting them in pairing mode is less than convenient. (I need to turn them off, then turn them on — that’s the somewhat-clumsy part — and then pair them. They’re then in pairing mode for two minutes.) Disconnecting them each time is actually simpler, but still quite annoying.

My original post inquired about the possibility of a shortcut or something I could use with Siri, along the lines of “disconnect hearing aids”. But I can’t find any action in the shortcuts app about connecting or disconnecting a specific Bluetooth device. So let’s forget about that, is there any way to disable “auto-connect” for a specific Bluetooth device, or even generally?

I am Terminal- and Property List Editor-friendly.

TIA,JEFF