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From your essay, page 5, "But gravity modification is not the means for interstellar travel."
Yes it is, we simply have to understand how gravity works.
Have you been successful in presenting a paper to one of the 100yr Starship conferences?
I had submitted an abstract for a paper, for the 2011 DARPA/NASA 100Yr Starship Conference, that described how to produce artificial gravity, and it could be implemented as "push or pull." I included a communications section that would utilize the artificial gravity field for instantaneous communications for solar system distances and near instantaneous to the closest star to our Sun. My abstract was rejected, and I do not know why. Some of the elements of the communications protocol have already been developed for other purposes.
At least I thought NASA would be interested in improving spacecraft communications within the solar system distances, but no.
I am amazed that DARPA/NASA seems to have no active solution for "hazard avoidance" of the junk that is in space, and not just what is obviously known within our Solar system. The arms of our galaxy outline a massive debris path, and it is reasonable to expect that it will contain aggregations of solids, large and small, that can readily damage or destroy a spacecraft that does not have a detection and avoidance system. It is doubtful a starship spending a 100 years for transit from earth to some far Sun would ever make it there without multiple debris encounters. An artificial gravity "push or pull" could be used for hazard deflection, as well as for spacecraft acceleration and deceleration.
I have a number of references of how high-speed spin, with a specific handedness, results in weight reduction of objects above the spinning object or spinning EM field. My gravity push-pull implementation does not involve physically spinning objects.
It doesn't appear that any "solutions" that employ classical physics concepts get any consideration.