Dear de WILDE,
Good essay on new concepts TS, TC, ENM etc. And very nice development of these ideas were done in the essay, my congratulations.
Your words.... "It is widely accepted that 13,8 billion years ago somehow /somewhere the universe as we are (partly) aware of underwent a change that led to a conclusion that there is a "beginning". To arrive at a for the present scientific ideas an acceptable beginning of of nowhere, ideas like singularity and inflation were introduced."
................. You are introducing these concepts "Beginning and Singularity" based on Expanding Universe Models. These concepts are inevitable there. These concepts are based observation of redshifted Galaxies, which are 40 percent in the universe. They ignored rest 60 percent.
Have a look at my essay also where these singularity and Bigbang were avoided by showing relevant reference papers ...
Best wishes................
=snp. gupta