Thanks! That was not perfectly clear in the official list:
Check out all supported functions of the S3XY Buttons made by Enhance. Just like your Tesla, many more features will be added over time.
enhauto.com
which only says:
Headlights Low
This is misleading IMO. It should have said:
Headlights On/Off
or:
Headlights Toggle
Unfortunately, according to the official list this is not available on the Y. So I will still await confirmation this works on a Y before I pull the trigger. I appreciate your help. If nothing else, you've given me more hope. This and "Highbeam YOKE" would be the only features available on the 3 and not the Y so I'm hoping it's just a typo on the list.