I finally sat down and sorted out the bits left from my plants. Looks like I have 5 solid pieces I can restart from. It's basically back to the beginning, but I can work with it! I have a few new cuttings ready to go, too, so I'm interested to compare the growth on the 8+ year old pieces I'm reviving with the new pieces.
I do have one that is what looks like a mostly dead stem, but it has a ton of fresh roots growing from it. I stuck it in a pot with fingers crossed, but I'm not holding my breath. If the little guy shows any signs of growth at all, I'll make sure to snap some photos, cause this one is definitely the underdog of the bunch.