This larch is one out a hedge which was about 55 years old when I dug it. One root is living and for airlayering it is to old I think. The base of the trunk is ok and perhaps the root will grow onto the trunk. I prepared the bark, take a cut in and screw it near to the Kambium ... perhaps it will fit , so I didn't need to take other options.
This year it grew free in a pot, now I planted it into a drumpot and next spring I will style it like a bunjingi with more than 3 branches ;-) ...

saludos
avicenna

This will be the frontside. It is in a round pot and changing the plantingangle is very easy ...