The more I think about it, given how the 80 series' seat tracks bolt onto the flush surface of the seat, a J#@P Grand Cherokee Limited seat might be perfect. They are EXTREMELY common, and honestly one of the most comfortable seats I have ever sat it. They have a mounting plate that comes down in the four corners, I believe front-to-back there would be enough plate to cover the ~13" inches needed to drill and bolt in the seat track, but I think they are narrower side-to-side than the ~13" needed. Possible a small plate could be fabricated to give the extra width.
I will confirm this, this coming weekend. I have these in my wife's XJ, and I need to finish up some work on the heated seats anyways. I will take more photos. These seats come in tan, charcoal grey, and black. Same seat bolt pattern from XJs (97-01), ZJ (94-99), and WJ (99-2004).
This does not solve the armrest issue, which I think is kinda the crux of the issue for most of us. I have been doing some scouring for how to add an armrest. There are plenty of wise minds in this forum that could likely cook up an easy solution.