Thanks for the update on your experience. I don't have this wired remote
and it's good to know that you can't access the camera WiFi API while the
remote is plugged in. If someone (preferably a company) were to build a
wired remote, the developers could use the USB API to grab battery
information and trigger the pictures and video. It's possible to build
something around a Raspberry Pi Zero. See this info.
Of course, this is not helpful if you're not trying to build a product.
However, maybe the entrepreneurial bug will get you and you'll build a
small business to meet the need for this type of accessory that you could
make some money from?