The way I'm going to approach it is to adjust the MT 55 base to fit the Festool rail/splinter strip and then I can use it along with the TSC, HKC, GRS-16 and GRS-16 PE.
Because everyone fawns over the Mafell rail system, I'm going to purchase the Mafell Aerofix rail to use with the P1 cc and MT 55.
I finally broke down and ordered a MT55cc. Just the bare unit with no clamps, tracks and wotnot. I have plenty Festool rails and, more importantly for me, lots of add-ons fitting the accessory slot (parallel guides, stops etc.) so staying with the rails was the way to go.
After swapping in a plug-it connector I moved on to getting it snugged up for running on the tracks. Shock of horrors no amount of twiddling the two cams did anything to help the saw slide. You really had to shove it even with them slackened right off. Turned out there was some rough stuff on the base casting that was causing it to bind. One small bit of filing later and it was running 99% as well as the ts55. Phew! I have a Bosch rail and it does run very smoothly on it but no accessory slot makes it a non starter for me. Especially given the other Festool saws.
Very nice saw. Should manage to recoup a good chunk of the cost selling on the ts55. I'll be sad to see the trusty old fella go [for a split second].