I just had an idea...
Remember the trick we used to do to have the RX5xx working with the older drivers? I.e. Physically copying the content of the older driver's folder onto the new one, effectively tricking Windows into thinking it was using the new one?
Maybe something like this could be attempted with the Vega blockchain drivers too... I mean, if you have driver instability (devices disappearing etc) it could be worth a try...