SB3: Switch-Off S/PDIF when SB3 in stand-by

Hi all,
I am using a SB3 for sourcing audio to a pair of Genelecs (8331) via S/PDIF (AES/EBU).

The Genelecs use signal sensing for powering on/off. They interpret the presence of a bit-clock as 'power-on':
https://support.genelec.com/hc/en-us...ignal-Sensing-

Undortunately, the SB3 keeps the S/PDIF output active even when set to standby. That prevents the Genelecs from powering down.

Is there any chance to disable the S/PDIF-output when the SB3 is in standby? Any SW-hack? Any HW-modification?

I would highly appreicate any input!
Cheers,
Hering