Red-leaved Norway maple is probably either crimson king or crimson queen (both properly red all year round) or Schwedleri (red on young growth only). All 3 of these will show a high degree of red in seedlings. About 50% of crimson king seedlings are true to their parent I believe for example. They germinate well too and grow fast (I have a load of bright red crimson king seedlings padding out a mixed hedge for example, 1 of which is better than its parent IMO). In other words if there is seed to be had grab a load of it, sow it in a protected bed (ours provides volunteers by the dozen) and pick your favourite. I can't answer your question regarding the grafting but thought you might like to know it may not be necessary.

In the areas they are hardy, they have wreaked havoc on natural areas and become a major invasive pest plant. If you're going to propogate something, why not a sugar maple or red maple?

tai_haku, thanks for suggesting collecting and growing the seeds, sounds like a good idea to me! ... just too bad I had not read your message while I was there in Japer!

quirkyquercus, there are very Norwary maples able to survive my severe climate, so guess no worry about them becoming an invasive pest, but I appreciate the info! Indeed I am also interested in attempting both the sugar and red maples. Thanks guys!

Terry