I finally managed to burn Aidan's rom onto my Mecool M8S Pro W (905W) Android TV box.
Took several attempts, but what finally did the trick was to burn with all the wipe-options disabled and then doing it immediately again with them on. (maybe that information could help someone later on...)
Now I'm just hoping someone could help me with these two issues I'm having:
1. The remote doesn't work. Or actually it does, but only certain buttons, and they're all wrong

For example the TV IN button seems to act as OK, and the right button is volume +. And then numbers are scattered all over the place.
I'm assuming this could be fixed by editing the keymap files (/vendor/etc/remote.conf/tab1/tab2/tab3 or /system/keymaps/*.kl) but the information about what to edit is so widely scattered all over the place that my head explodes when I try to decipher it.
2. WiFi (and Bluetooth) doesn't work. I don't use bt on it so I don't care about that, but the place I'm intending to use this device at is a bit far from my mesh AP's, so ethernet cables are out of the question. I imagine this could also be solved by using the wifi drivers from the original FW, but again, the information is all over the place. I also kinda assumed this would just work as the image I used was for the exact chip my device has, but nope. The remote only works on this one by the way - when I burned one for a different chip, the remote did absolutely nothing.
This said, I haven't tried a usb wifi dongle yet - I have a spare one, and if that works, I don't care about the wifi issue anymore. Nope, dongle didn't work either
But the remote would be pretty nice to get to work...