Another option.
If you have a good relationship with your local Ducati dealer (and their service dpt.), you can ask if any one of them have that special tool in his tool box.
You can buy the stock large head bolt (they will fit) from them, ask them to swap the bolt.
Then, you can remove the bolt with regular socket once you get back home.
(Don't ask if you can borrow that ST.)
As for the rear set for S*R bikes, some products will cause rear suspension binding problem, so be careful.
http://www.ducatimonsterforum.org/index.php?topic=20280.15Old thread, but worth reading.
The ones that have “proper design” are ,
DP (AELLA) (the ones you have now)
Sato racing
Rizoma
Cycle Cat
Don’t buy Gilles tooling, in any case.