My Wiimote is a pirate clone of an original Wii Remote. Bluetooth detects it as "Nintendo RVL-CNT-01"
NES mini controller is official one. Brand: Nintendo, Model: CLV-002 😃
Bluetooth adapter is integrated in Raspberry Pi 3b+, I dunno what chip is used.
I just connected the NES mini controller to Wiimote. And it worked fine for me. BTW Wiimote is still functional. For example, 1P can use Wiimote to control the game and 2P can do it with NES controller and vice versa 😃
The first 3 Command & Conquer titles are "Freeware". Tiberian Dawn, Red Alert 1 and Tiberian Sun were released to the public for free with no licence to them (GPL3, MIT...).
I'm not sure under which license CNC Retro would be. (Public Domain??)