Unfortunately, the WR802N doesn’t have GPIO contacts, so it can’t be easily converted to 3.3V. I don’t currently have an unmodified WR902AC available, so I’ll have to figure out how to compare it for the measurements.
This too is where my exploration of the 802 ended. I am tempted to look for a test point or leg of IC, but that would be getting into a pretty difficult hacking (for me and most folks).
Thank you for the report Eric, very helpful to hear what you are hearing….