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if you can point the scope at star A with ra of ??, feed that into the laptop, and then step to star B with ra of ??, then the computer should be able to compute the scp easily.
i have seen where there is a siter on the base or platform to help with alignment. it would be easy from there.
you could even drill a hole in the top bit of the base of a dob, so that when you put on the platform or buggy, then if the base is pointing at scp, then the scope will be. thus polar aligning & calibration at high mag would be possible.
just like we do with the siters on top of out scopes. We use the 200X of the scope to alignt the buggy or platform.
If the base is stepper driven separate to the tracking side of things, then you plonk the buggy or platform down roughly south, make sure dob is mounted so that the scope is pointing same direction as buggy, calibrate through siting and entering co-ord into laptop, then the motor can swing the base around, but not the footings, so that when the eq is operating, you have scp lined up.
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