Aqua Velva Ice Sport smells like Cool Water/Aspen. Hard to go wrong with that. I would suggest this before Preferred Stock. I have a few small sample bottles of the PS aftershave and it's good, but there's other muskiness in there that I think overpowers any soapiness you might get from it.
Gillette used to make an aftershave called Wild Rain, which was very green and bright with a hint of fruitiness. Not a dead ringer for Irish Spring but definitely complementary.
If you really want something that goes almost 100% perfectly with Irish Spring, it's Sung Homme aftershave. I have about half a bottle in my collection and it's nearly identical to vintage Irish Spring soap from the '80s and '90s, before the 2000s reformulation of their "Ulster" scent.