Well that's just awesome, thanks!
I can see now that those mounts are made for the long shaft extensions; that makes a lot more sense....to use one for a short shaft would be kind of a waste.
My biggest concern about the mount is that it puts the stick far out from the mounting surface. That would mean that I would have to have a far reach to my throttle quadrant with my left hand, and the stick would be much nearer to me for my right.
The solution would be to get two of the mounts, and use one for the quadrant. The mount fits their own throttle and they have adapter plates for others, like the Warthog throttle. However, none of those are multi-axis quadrants, and I've really grown used to having that feature. I think I could gin up an adapter plate for what I have pretty easily.
One very interesting item of interest between the two sticks is that the VKB has 20 degrees of movement, and the Virpil has 15. Theoretically, this would make the VKB more accurate in control. However, with the stick extension, 20 degrees of movement might seem excessive. Here's my take on it: You can always reduce the amount of degrees that it takes to get to 100% by creating a dead zone of any size you want, at the end of any axis. However, you can't make one larger. In my opinion, the whole idea of using a stick extension would be to eliminate the need for response curves at all, since the stick is (nearly) the same length as the original in the real airplane.
The Virpil also comes with 3 different spring sets, so the weak spring symptom this guy had with the VKB would seem very unlikely. He does make a big thing out of the adjust-on-the-fly feature the Virpil has; however, that's just a fine adjustment. The really good feature is the changeable springs and the fact that it comes with them (as well as 3 different centering cams).
It's all a moot point if you can't actually purchase a VKB though; and I have an idea that 15 degrees would be pretty practical with the stick extension; and with the Virpil, you can not only get 3 different lengths, I'm thinking you might also be able to gang two or more together. In terms of accuracy, what matters in the end is how far the stick travels at the top where the grip is. If that's the case, you could get the same amount of travel just by lengthening the extension and lowering the base.