This post is aimed at answering questions 2 and 3.
So far, I haven't found any single adjective that seems to have been clearly the first to be used in the metaphorical expression "a(n) [adjective] bone".
When I say "goes back to __" in the following sections, it obviously means "goes back to at least __". There might be earlier examples that I haven't ...
When doing a Google n-gram search for "racist bone" I came across a reference to a November 1967 issue of Jet magazine. It references a quote from Louise Day Hicks, a Boston politician and staunch opponent of school desegregation. Mrs Hicks and her supporters "insist there ain't a racist bone in her ample Irish body."
I'm not sure how much this qualifies as a complete answer, but here are my current findings:
not a lazy bone in his body - 1826 (paywall link)
The Morning Post (London, England) 07 Aug 1826 4/1
not a racist bone in [sth] - 1966 (paywall link)
The Times (San Mateo, California) 07 Dec 1966 53/4
Not a jealous bone in my body - 1875 (paywall link)
Are these two expressions (mean bone/racist bone) related to an even earlier "[adjective] bone" that was used in a similar way, or is "mean bone" the first of its kind?
This is a partial answer concerning lazy bones.
The OED shows a 1593 use of lazy bones:
1593 G. Harvey Pierces Supererogation 185 Was..legierdemane a
sloweworme, or Viuacitie a ...
You're the point person. Merriam-Webster:
: point man sense 2
2 : one who is in the forefront especially : a principal spokesman or advocate
(example) the point man for the President's economic policy
A point person leads an initiative, a task, or something else. That person tends to field inquiries and make decisions about that area ...
Your usage of 'for' is acceptable as Kate commented. I'm sure the reason you are asking is because it sounds a little clunky. This is what I would do to simplify it.
The umbrella section “socioeconomical understanding” was chosen to mediate the understanding of innovation in X industries. The following subsections are intertwined in their individual ...