You could use the crosshair reticle in Frame/Focus mode in Nebulosity - you just need to get it very clear in your head which way is which before you start - ie line up camera so RA/DEC drift follows the crosshairs, work out which way is west by watching which way a star drifts with the RA motor off etc etc
I've already sussed all this with my eyepiece, so haven't used Nebulosity for drifting but would be worth a try.....
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