Taper steerer or straight? If it’s straight, a zero stack lower cup on the headset will save you a good few mm? Tapered 180mm will be very tight on a 19″ frame.
I was bidding on some forks with a 165mm steerer, to go on my 17″ Sherpa (100mm head tube). I measured the stack height as 126mm top to bottom on the headset, plus 40mm for the stem bring it up to 166mm. Unless I missed something, that would have just fitted together with minimal spacers. Adding 20mm on for the 19″ frame brings it up to 186mm. That would be borderline I think, but it’s possible your headset could be a fraction slimmer than mine.