Yeah I'm not even messing with anything yet myself. Seems like there's a new patch almost every day.
But as far as the scripts.txt goes, did you just add an "f" section between the "e" and "g"? At least in my scripts.txt the 0-126 totally skipped the f's. So now I'm guessing it should look like 0-147 after inserting the background colors for the f banners.
Also, from what I'm seeing in-game, it looks like the purchased exclusive banners are seen over top of the custom banner packs. I haven't messed with it yet, but I'm thinking that if you don't want to see the exclusives, you could probably overwrite those simply by renaming std_banners_a.dds to std_banners_custom_a.dds, and so on.
Kinda neat seeing the exclusives for now though so I haven't played around with it to see.
