I removed an air layer from this Jolly Tiger a couple of years ago and a shoot sprouted up from the same location so last year I put a cup around it while it was still green and slowly added soil as the wood lignified.  I thought it had enough roots to support it and it would grow faster on its own.

[video]https://www.youtube.com/watch?v=p3uDJTNfQfM[/video]