They have been done, i have done this months ago, shared the roms here as well. Check the op.
Links are working now, thanks. Do you have a thread for RX series / Polaris cards? My RX480's are dieing to get some static undervolting

Haha, no not really, i posted an RX rom somewhere with vddc offset, not sure where :p
Probably not going to create a thread regarding this. But perhaps some day..
Greetings