Did you read the post immediately before yours by W0nd3rwi3ss, Damian? Did you try that solution? I have and it works wonderfully.
Thank you so much W0nd3rwi3ss - a brilliant idea and this has finally stopped Windows Update from putting that horrible old driver from 2021 in place of my shiny new AMD provided driver. Next I need to work out how to stop Dell's Support Assistant software from offering to update to their approved driver as well but at least that is only offering the driver and isn't forcing it on me (so I just ignore it).