We have been running RMK’s mk902ii, It is android based and solid as a rock. It does not have Windows Remote Desktop, but you could install a small VNC server on it. The CMS supports it.
RKM RK3288 Quad Core 1.8GHz Cortex A17 Android4.4TV BOX 2G RAM, 16G ROM,2.4G/5G WIFI, Gigabit LAN, 4K H.265, Bluetooth 4.0
Ethernet and Wifi w/5GHz and big external antenna, plus expandable memory via SD card. Did I mention small.
We buy them striaght from RKM for $95 USD each.
We have seriously been through 7 different small units before we found this, and it just beats everything else hands down.