Thank you all for your good advice. I must say I'd prefer any option that does not involve surgery, and the recommendations above imply that too. You mentioned, Brent, the heat treatment, and it looks the best option to go with. A long period of just "cold bending" has had a beneficial effect, but I am sure with heat the results will be longer lasting. Not knowing much about the behaviour of glue when heated I followed up Marshall's lead and found the information published by Hideo Kamimoto, and was surprised to find his placement of clamps and jig was very close to what I have done. Going further I found good information on the effect of heat on Titebond 1 compared to hide glue, in "frets.com"
Aliphatic resin gives me the creeps!
Heat Testing Glue Joints
© Frank Ford, 4/25/98; Photos by FF, 1997
So there is no doubt that heat softens glue, to the point of complete failure, but I wonder if it regains its strength and adherence qualities when cooled. I assume it does, or I doubt the process would have been described as a cure for a bowed neck. I will proceed with cautious heating.
Thank you once again, gentlemen, for guiding me toward the best solution. I am indebted to you, and the Delcamp forum this excellent advice.
Rodes ca. 1972
Mitsuru Tamura mod.3000 1979
Manuel Contreras 1a 1986