To keep the V-belt Ford A/C, plus the V-belt trailer vacuum pumps, I had to fabricate a "B" V-belt system piggy-backed atop the Cummins 8-rib serpentine system.
I love having both styles on one engine.
I highly recommend against putting a serpentine pulley on the YORK, as should anything happen, you are gonna have to take it out of the loop; this is much easier when it is V-belt driven.
I searched through a pile of discard pulleys at the lawn-mower repair shop until I found one that had a solid flat center that was of similar diameter to the serpentine pulley I intended to mount it beside.
I had my machinist friend to precisely bore bolt-holes to match those on the serpentine pulley.
I have since done a couple myself, just using best judgement and my drill-press and haven't gotten a wobbler yet.
If you have a thick alternator pulley and room around it to add a V-belt pulley of larger diameter, then it is an easy task to drill/tap the perimeter of the thick alternator pulley and bolt a lawn-mower deck-pulley to that.
If you are fortunate, you will find a pulley that has the center offset just a bit outside the V-belt path; otherwise, using a pulley with no offset, you will have to build in the offset.