Just to follow up. After waiting for quite awhile and learning some more in the meantime, I finally picked up a used set of Mirages from about 2000 off of Ebay.
From reading it seemed I'd like the shape of the 2nd generation shifters more than the first so I waited until I could get a good price on something newer than 98.
Anyway, I mounted the left shifter last night and it does indeed work well with my old mountain triple including the derailleur.