Hello
After checking your requirements, i feel can help you to do on your project.
I have some design for old customer, using a led matrix display, connect wire network: RS485, CAN, also wireless network: sub-rf, Wifi and Bluetooth.
So I can confirm to help you have a final product ( with support to make a board , aslo assembly and testing services)
Im new on freelnacer, but i worked more project on another freelance site.
Please give me a little time, I promise will give you suitable solution.