I think all will be good too

(video is ok, Controler with usb is ok,...)
The only "matter" is the audio part I think... In recalbox 4.0 the sound isn't well handled by gpio. You need to use wiringpi (and it's not by default in 4.0)
But the 4.1 is really near to be released and wiringpi is in it

so before february (when you start sending RaspiBoy) the Recalbox 4.1 will be already out
It's just to let you know : If you try right now with 4.0 sound "maybe" not work with GPIO, only with HDMI

(but it's not a dead end

like I say, all will be good before february)
again, great thanks for your work
