I dont believe it'll work for
SC to Iphone, or vice versa, as both the
SC and Iphone (as well as any other device that allows displayport video ouput, via USC-C or Lightening connectors) are output only. They wont accept any data, just a charge.
You will be able to use the
SC USC-C port on bottom of
SC to display the
SC screen onto the 35E glasses, although, you must have the correct data speed transfer cable. Look for USB-C 3.1 (anything below that, ie: 3.0, will not work).
I prefer to use the HDMI port though, mostly because the USB-C port is your only method of charging and your cable will be very exposed, hanging out of the bottom of the
SC. If that port gets broken, your
SC is going to need to be opened up for repair... Going the HDMI route, is more cumbersome, I admit, however, with the right combination of Left-Angle HDMI & Left-Angle USB to USB-Micro cables, you can tuck away the 35E controller under the
SC and without blocking the antenna's.
Just my 2c after nearly breaking my USB-C port, so be careful!
Good luck