https://www.kenable.co.uk/product_info. ... ts_id=8681
They confirmed their Pro Signal adapter (PSG03882) has a 17mm plug, which should match our needs.
This seems to be the first AVAILABLE adapter, though
- it's available in U.K. only (?)
- you lose the microphone-channel (TRRS-to-TRS).
But after all it may be the only partial solution at this time
