I just came across this and thought that I would share:
Mayflower Electronics has been selling modded T50RP MK2 for years (along with other headphone accessories), I just saw today that they will be soon be offering a modded T50RP MK3.
Looks like they are using the Shure 1540 pads and are doing some internal mods similar to the MKII. The MK3s are on pre-order now for about $260, might not be a bad deal considering that the 1540 pads are $40 retail + materials to do the internal mods (Mayflower sells a mod kit for $20) + the time to apply the mod, (etc., etc., etc.,)…
Could be interesting…
Here’s a link to the product page in case anyone is interested:
https://www.mayflowerelectronics.com/shop/headphones/fostex-t50rp-mk-iii-version-1/
(note: I have no affiliation whatsoever with Mayflower Electronics, I’m just a satisfied past customer, passing along some info)