Hey Livingspeedbump, speaking from having keyboards like the planck, the 108-key, and some non standard boards, I would definitely be in for a pack that had row4 and row1 novelites. Troubledminds, Nantucket, and especially DangerZone really fit the bill (Carbon used it as the number stripe which also was a fresh approach). It works great for replacing the tired home, end, pg up, pg dn, ins, del, scrl, prtscr, and brk keys (on every tkl), and also for volume keys (on 108-key boards), and also for windows, alt, edit, and ctrl keys (on nonstandard bottom row boards).
I was just thinking about the McD's keycaps you created awhile back. Jukebox goes with cars, tv, radio, shakes, burgers and fries. I'm not trying to suggest a novelty set that would overpower the classic theme of vanilla and mint with the splash of red, but I just wanted to add those interests to your amazing set. Maybe in lieu of pictures to the same, perhaps one-word or two-word phrases from the era to replace those TKL keys (not changing the traditional labeling but adding a twist for those interested).
Definitely in for this set when it comes back for a second round. Great idea too for breaking out the TKL standard kit into separated kits. I will pickup extra sets of alphas as I did with Carbon because I end up being able to fill more than one board.