I am new on here and in my wanderings the last few weeks found this posting, am wondering if a technique like this might work well on cuttings. Would wrapping and layering the bottoms with hormone and paper prevent the hormone from washing away or get scraped off a bit when you put it into the soil. I'm guessing you would skip the wire in the case of cuttings though. Thoughts? Also any comment on powder hormone vs. the gel kind?
Paper would likely mess up the emerging roots or at a minimum keep them held close to the trunk. Could work but I think unnecessary.
My personal preference is Wood's Rooting Compound (has IBA and NAA / NAD) or some generic like IBA (indolebutanoic acid); best results have been when it bound to a Potassium molecule or ion (not sure) and has an alcohol base. This shot-guns the solution into the tissue and I use the quick-dip method for cuttings. Powders like Rootone are a bit weak for most trees IMO and Hormodin 1,2, or 3 are powders at different strengths that I feel are effective. Rootone does have Thiram (a fungicide) in it but you can just buy a fungicide depending on what usually affects a give species and apply separately. I usually use a chopstick or something slightly larger than the diameter of the stem cutting when using Hormodin products then place the cutting in the hole and firm up the media around it each time.
I've done some very mean things to Acer palmatum in the past such as taking a 10 foot tall tree down to 4'' and removed 90% of the root system (July in Nashville, TN). The trick is not to water it after the initial watering in for a few days. The sap will not bleed as much; especially if you cut off most of the roots.
That is a pretty big secondary trunk on the maple you've fount and it will be difficult to make something out of that IMO. By all means go for it as the experience itself would be valuable for future projects.