Hohoo! Bucket'o'worms, this one turned out to be.
Thanks for the respones girls, they were all(most) useful. I do have a single standard tower at the moment, but I'll prolly do the double-tower-trick before my first crack instead of afterwards. This means that the nifty trick by Paul will be preferred. Of course, I understand that this won't let me remove just the shock, but as I understand it, it will still make it possible to remove the shock with just undoing one nut. (With the bolt still attached to cap.)
The only advantage I can see with the Lunsford bits, that I believe hasn't been pointed out yet, is that when you remove both shocks you don't have to remember hole position as the bits are left in the tower. The Lonestar-method demands a minimum of brain activity as well. That's got bad news written all over it for me.
Actually, this gave me an idea as I'm writing this post.
1) Grab a loooong screw.
2) Enter a normal nut or lock-nut, apply insanely stiff thread lock at desired point and pass nut over it.
3) Dremel of the head of the screw.
Voila, you have a Lunsford-bit-rip-off with long enough threads for thick towers. Ok, you can go ahead and call me flattering names now.