Is it possible to specify, or perhaps supply, the steel of the tubes used in sleeving? Tubes made of high quality steel like the Boehler Blitz, will probably result in lighter barrels than the original and stronger too. They will be a female dog (censored original text) to blue though.
You could order stainless barrels on a Darne when Firearms Center, in Victoria, TX (James Wayne) was importing them. The barrels went to the plater, who plated them with iron, and then they were blued. In 1964, XTC, a high chrome French tool steel, became the standard barrel steel, and the chrome content was high enough it caused problems with bluing.
That was resolved fairly early on, but, the guns with the barrels they had trouble with, turn up, here and there.
Best,
Ted
