VB isn't difficult and i'm sure if you get stuck there's plenty of us that can help. My Boxford lathe uses a stepper on it's toolchanger. When reversing onto the rachet enough pulses are sent to the stepper for about one and a quarter tool positions. The boxford changer is so much quicker than the Orac.
It so happens i've a spare stepper driver built in the Orac and will have to get around to following your lead.
Thanks for sharing.
John