Okay, I might pursue using the Tuner serial port for the BT module connection then. This way would leave the empeg's primary serial port available for the usual troubleshooting etc. without any conflicts or special handling needed.

The Tuner port is (I believe) 5V TTL logic, which will need to be voltage adapted for the 3.3V CMOS on the BT module. I expect just a couple of resistors will do the trick, but will find out when I do it here.

Cheers