Regarding 007 contesting Idi Amin Dada, Amin was president of Uganda from 1971 to 1979. With the Solo story set in 1969, Bond could only be encountering a pre-presidential Amin. At any rate, even with some time-bending, Bond, apparently, would not succeed, since Amin stayed in office to 1979. OK, sometimes things do not go Bond's way. In summary, however, I would find it quite surprising. If it occurs in the novel, it might just be something of a "cameo" appearance by a pre-presidential Amin, not the primary adversary for Bond.
Of course...I could be quite incorrect about these expectations and estimations.
What to make of this title ?
Surely Boyd learned that Fleming created -- and named -- the Napoleon Solo character for The Man from U.N.C.L.E. tv show. (btw -- that wound up being a MUCH superior title to the two proposals which preceded it)
Surely Boyd is aware that in both the books and films, we've already witnessed a "Bond on his own" story....sigh...
Surely someone at the publishing house must know a good-sounding title when they read one ? And might they not have suggested the persons proposing names for this one, well, you know, keep trying ?
As long as no one uses a line like this promote it:
....and this time, it's personal