I am yet to try layering a pine. But it is possible and radiata are easy to take from cuttings compared to other pine species. So I would give it a go as many people successfully layer JBP's.
You could even try a few at the same time...the tree sure is big enough and being that it is in your backyard, it isn't going anywhere
I'd try it for sure, maybe the torniquet method or a combination of that and the ring bark method.
Whatever you do, please be careful climbing up that tree matty-j!
Best of luck and let us know how it goes please.
Oh yeah, I am not disagreeing with Hackimoto at all

I was just thinking that root grafting may be a little trickier if you haven't done it before. Air layering may be the easier option (or at least it would be for me).
Maybe you could try both methods as it is a good chance to practice them
Cheers, Dario.
