I believe that Honda has 7 tumblers. The seat lock unit only has 2 of the seven.
Also see if you can get one of those dentist mirrors and take a sneak a peek a loo under the ignition barrel. The numbers are on the barrel but they face towards the steering head.
Hope this helps.
Let me say once again from experience. I had the same problem. I loosened the tail section and was able to remove the cowl cover by popping the latch with a screwdriver once I had the tail section fasteners removed. After that, I removed the lock assembly and a locksmith used those numbers to make a key. It works fine.