Ditto on the non-stock choices but I'll add that sleeving a cast iron leaker with stainless steel also works- White Post Restorations in VA does this. If you find one used, long throw slave cylinders are either all stainless steel or aluminum for zero maintenance, and fit in the stock bracket.
I've run an adapted Tilton dirt track racing concentric-throwout for 25 years, and with that part the entire slave cylinder, all linkage and cross-shaft in the bell housing are eliminated (6 lbs lighter, anodized aluminum and far less complication) plus they are long-throw as well (ZF synchro benefits).
But concentric throwouts are EXTREMELY sensitive to internal clearances when setting up cold. The clutch in a Pantera changes clearances to the tight side when hot. You need to follow the directions EXACTLY to the thousandth which most guys do not. Get it too tight when smoking-hot and as was said, in 50 miles you will be pulling the ZF and rebuilding the $300 throwout. Plus, Tilton and others do not make a mounting nose for a ZF so you get to machine that part from scratch or adapt something. Good luck-