The "C" shaped tool can be purchased from any Ducati parts source for $350 +/-. The flat old style wrench is hard to find, but europeancycle.com can get them for $300+. I about choked. Anyway, I can have one fabricated at a local welding shop as a last resort, but I thought if some enterprising person wanted to fill the void by building one (or some), I and others would probably be willing to pay a fair price.
If someone wants to loan or rent me one, I'd go for that as well. All Ducati pilots are trustworthy, right?
I use a 15 mm wrench and place the square end of the torque wrench in the other end of the wrench. It just fits in and wont slip. If you keep the angle of the torque wrench 90 degrees to the 15 mm wrench, you torque the bolt to the required settings and read it directly off of the torque wrench. This is so because at 90 degrees you are not adding any leverage to the 15 mm wrench and just transmitting the torque generated by the torque wrench.