That's similar to the approach used in the past for the D2 master pin. Cat went away from that presumably because it wasn't as effective as a straight, interference-fit pin. Could have been due to cost but I doubt it, given how simple the plug and pin components were. If you're regularly exchanging buckets, it would be helpful. I know that it's quick and easy to split my D2's tracks with this system, but I haven't driven it long enough to see how long it stays locked.

I think even if you go with the expanding pin, the bushings / hole in the end of the stick will need to be in good shape first, and I'd wager that that's a stipulation in the warranty. If you have to line bore and add new bushings, you might be back to just using a regular pin again where you don't need to worry about a warranty or regular re-torques