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The Vixen Skysensor 2000 does this, sort of.
You set the mode to “Equatorial, Non-polar aligned” and then do a 3 star align so the SS2K does its internal mapping and works out where it is pointing to. Then you GoTo a 4th star which should be centred in your illuminated cross hairs.
Then, you change the mode to “Equatorial, Polar aligned” and do another GoTo to that same 4th star and the mount will slew a small distance based on the offset from the SCP.
Tweak the Alt and Az mount alignment knobs to re-centre the 4th star and you are now polar aligned.
Cheers
Dennis
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