I asked the same question to my Honda Dealer, C&C Sports. The Parts Department said they had one universal wrench in stock which did not fit. The parts guy just shrugged his shoulders at me, and sent me to the service manager. The Service Manager tried turning them with his hands and could not get them to move. He said "Stick a screwdriver in the holes and turn them". I told him there is not enough room to put a screwdriver in the hole that will give you enough torque on the shocks. Besides the metal is to thin to turn them this way, all you will do is distort the metal. He walked away and left me standing in the parking lot stewing a bit over their technical expertise on Honda motorcycles. They won the "Stupid is, as Stupid Does Award" for the day.
I went home and looked at the shocks, It did not look like a "Rocket Scientest" problem, so I took a pair of channel locks, duct taped the jaws to prevent scratching and adjusted the shock in couple of seconds.
So the official Honda shock tool is a pair of channel locks with duct tape wrapped around the jaws.