Amplifier BT30D Pro Disable Bluetooth

[Long peter]

I'm looking for a way to disable Bluetooth on the BT30D Pro. It's a little champion of an amplifier but it rather surprises me that the Bluetooth input isn't secured in any way and takes priority over the wired input. Anyone in range can get up to mischief if I'm not already using the BT input.

• I can't simply leave a BT device connected all the time as that mutes the RCA input.
• Removing the antenna is better than nothing but doesn't prevent a connection entirely.
• Faraday bag?

Ideally, I'd want to still have the option to use Bluetooth without having to open the case more than once. What I'm considering is either an SMA cap that might attenuate the signal even further or possibly opening it up and seeing if I can add a switch to the power trace for the BT chip. It looks like it is all very small and fiddly surface mount stuff though. Not sure my soldering skills are up to that level of precision.

Honestly, I wish they'd just put a source selection switch on the thing. A balanced input would be nice too as long as we're dreaming, but I don't know where they would put it on such a small case. The thing is a marvel of miniaturisation!