Sorry for taking so long to reply to this, but I needed to get another stick to do a comparison for you.
Assuming my newly arrived DOT stick is the same as your Xenophobe (I can't be SURE until my Xenophobe base gets here next week sometime) there are two pieces that differ from a true Tron stick.
The first is a clearish rubber travel stop near the top of the base.
On the DOT stick it is set square to allow 8-way, and on the Tron stick it's set at 45 degrees to force a 4-way.
As best I can tell (since I forgot to bring calipers home from work, the opening in the rubber piece inside is the same size for both sticks.
That should mean that with some careful cutting, reorienting and screwing, you should be able to rotate the one you have to work properly.
This will involve hacking the corners off to make it fit though, so I'm not sure if it's something you really want to get into.
The other piece that is different is the restrictor plate at the bottom of the stick.
These are red plastic on both my sticks, but I'm not sure of the color on a Xenophobe stick.
That plate is set square for the DOT stick and 45 degrees for the Tron stick as well.
The opening on the one on the Tron stick is slightly smaller than the one on the DOT stick.
I don't think you'd get away with just rotating that unless you really backed off the leaf-switches and made the stick sloppier.
You could probably replace that piece with a piece of Lexan cut to the right size though.
The metal stick rides against it, so swapping to Lexan shouldn't wear anything out I would think.
If this is something you'd like to give a shot at, PM me and I'll bring calipers home to get better measurements for you.