I'm sorry I can't give more help, but I'd also explore what happens when you tether an iphone to a Windows 10 computer to share the phones wireless connection. This requires only an ordinary charging cable and installing itunes on the windows machine. I believe it does something similar to rndis networking as well, but have not explored it.
good luck with your project and I hope you get something like this working - all of us could use it...
M