Dear Peter,
thank you very much for your comment.
As I've a very specific understanding of inertial frames, I do not know whether my view is useful for you or not.
To give an example: I think inertial frames do not have any real foundation. To state them as a universal principle like the Special Principle of Relativity is to my opinion the result of a somehow tragic extrapolation.
As in the realm of low velocities the state of rest and the states of motion were indistinguishable from an observational (!) point of view it was erroneously concluded that they are also indistinguishable from a principal (!)point of view.
By this transition an observation, that was made in a very restricted corner of the universe (concerning only very low velocities of our everyday world), was extended in a quite "unhealthy" way. It was henceforth considered of being realized with respect to all velocities including very high velocities.
This huge extrapolation was mainly supported by the MM-Experiment and the KT-Experiment. But if these two experiments are interpreted in the way, I've proposed (i.e. as experimental evidence of the two faces of c), then this experimental support can no longer be used in order to justify this extrapolation, i.e. the principle of relativity.
Although the MM-Experiment did not contribute to the genesis of special relativity it has essentially contributed to its rapid acceptance afterwards. This was even recognized by Einstein himself. In 1915 de declared that the successes of the Lorentz theory were so significant that physicists would have unhesitatingly dropped the principle of relativity, if an important experimental result like the MM experiment had not existed. And I think, he was right with that.
In brief, the notion of an inertial frame as well as the principle of relativity are - as conceived by me - highly misleading concepts. They prevent us from perceiving reality without distortion!
However, I wish you good luck for your paper.
Kind Regards
Helmut