Circumventing Newton's third law through Euler Inertial Forces

Dear moderator @Phi for All, Thanks to the valuable feedback of the members of this forum (especially thanks to @swansont, @joigus and @Ghideon) I realized where I was wrong (use of wrong definitions and unclear arguments) and I am asking for a third and final round (revised work) regarding the same discussion about the possibility of triggering motion in an isolated system through internal forces (Euler Inertial Forces). Again, I would be thankful to show me where I could possibly be wrong.

This is a wrong assumption from your part. We do not speak about real forces causing a change in momentum of the COM but fictitious one that possess no reaction. The fictitious force (Euler force) manifests in the rotating frame where the latter is enclosed in the inertial one. I dismiss nothing and nobody. I made it quite clear how the construction may acquire an acceleration. Now if this has further implications (as I show it in the relativity and Lorentz transformations section in my w