Here is a great article about collecting and storing scionwood.
http://www.seattletreefruitsociety.com/wp-content/uploads/2010/01/gregs-scionwood-storage1.pdf
If you have any extra scionwood I wouldn't mind trying a stick or two of your favorite and best trees. Those sound like some cool trees. Snap some pics next time you see them, it's always great to see those trees still holding.
My father is a hardcore birder and he was just telling me tonight how when he finds birds this time of year it is usually on crabapples. They can be magnets, he gets some great photos. He is making a trip up to Vilas county this weekend for some rare birds, of course they will be shooting right downtown because the small towns are littered with ornamental fruit trees and crabapples.