AC and PWR STR are 2 different belts running parallel to each other, no way to make one work off the other.
Both have idler pullers which are notorious for failing but at least are easily replaced.

If they deleted power steering it is most likely because the pump was leaking and it was easier to delete than spend the money to fix it properly.
Besides it spares the alternator from getting a constant bath in Str fluid (when the pump is leaking)

If you buy the van I would hook up belts to both systems, replace whats broken and live happily ever after.
BB