The best version of TPM we’re going to get is probably a theatrically graded version of emanswfan’s regrain for the 4K blu ray, with the missing elements patched in from this scan, the HDTV broadcast and digital special features.
I do not think regrain can compensate for the Wax Wars loss of detail on people’s faces that has been there since BD and even the much higher resolution in 4k BD/DNP versions does not fix that. I would take a good enough 4K scan of the original with its natural flaws over any regrained / heavily stitched up version made using the official 4K releases as primary source.