Ok so an issue with not disabling tech trading skewed my results... Indeed 0% means the civ will avoid it and research it last, and 50% means no effect, so hats off to Plotinus
Many thanks to you all! although the bit that I highlighted above is rather disappointing ...
... Quite awhile back, I started musing on what modern militaries might look like if certain Civs hadn't gone extinct. I noticed certain similarities throughout history - where loose versus close order formation militaries developed (e.g., steppe bow-armed cavalry and hoplites fighting in narrow mountain passes) and had hoped to guide certain militaries in different directions (large continental powers contesting the same mass - say, Eurasia - tend not to build aircraft carriers; seafaring powers never deployed the sort of "land behemoths" that the USSR did pre-WW2). So flavors won't ultimately help me there, which is a pity, as this would have been a far more elegant solution than combining Era=None techs with unit producing Improvements etc.
C'est la guerre.
Best To All,
Oz