TXT is theoretically the same as TXP, and has a longer toe than TX, so it's a little less forgiving, aside from being rated nominally at 320 instead of 400.

There is a lot of hype around PMK, and I've been going back and forth on the issue of "background stain" and whether it really has any significant grain masking effect, but the thing it does well is hold highlight detail, and the edge effects are real as well. I think there is some grain masking effect, since it produces smoother looking grain than ABC, but it's not obvious that increasing the background stain with a PMK afterbath does much to improve it, at the expense of raising base fog density.

Since you have the kit, give it a go. The stock solutions are very long lasting, and it's quite easy to mix up the working solution on the spot whenever you need it.