Dude, for these Honda/Clones there is No published Data! A few months ago you was against turning them 5000-5500rpm when I suggested it, now you say use Published data from a different Type of Engine that says 5800rpm. You're comparing a 460cc Single Engine to a Certified 1211.6cc Engine.
There MAX Continuous Rating hasn't been established. So No, we can't use the 912 or your VW Engine Data, you have to use the Engine in Question.