I can apply a sleeve to the end of the stripped cable, and a few minutes later, slide the PVC tubing over the drain wire. If I change my mind, and decide I want a longer piece of PVC, I can simply pull the short one off, and replace it with a longer one, without having to install a new sleeve.
Are you saying that you slide the expanded end sleeving onto the cable, sleeve your drain wire, terminate the cable then "un-expand" the sleeve? Sounds like a lot of work to me.
I think the answer to that is to leave the wires plenty long to begin with along with the sleeved drain wire and shrink the end cap over all of it. Then you cut to length the drain wire and strip the PVC sleeving off the drain wire where you need to with your strippers, just like the other wires in the cable. If I had to fuss with re-dressing the cable ends because it's too short it means I screwed up someplace. But that's just me. With shrink sleeving and the above method you can shrink multiple cables at once, cut, strip and terminate. Been doing it that way for over 40 years and never melted or burned a cable.
That said, whatever floats your boat. But there must be a reason why that stuff is hard to get and not seen in the US and I'm willing to bet it's because it's not very popular.
-Hal