Mort, in this forum, we are free to exchange respectful dialectic. I appreciate your interest and good thinking on this subject, but I present a somewhat different point of view.
First, UFO/UAP is an undeniable reality in our environment not withstanding questions regarding FTL travel. That is a legitimate question regarding the presumption that this phonemon must originate from other planets in our Universe, but there are other possibilities for explaining a source of highly superior technology in our environment. The possibllities of dimensional transition can't be ruled out, but remains speculative.
The possibilities of quantam entanglement playing some role in what would appear to be FTL are a live question.
We can not rule out possibilities of what I call a "geometric" universe that is connected in all it's parts and may not require "travel" persa, where you move one part of the connected universe, and the other end automatically moves without the "travel" of any information across the connected universe. Worry not, I'll not here attempt to spell out this thought that I've not heard elsewhere.
Is it not great to confront a real mystery that we can't yet resolve?