Sure, I'm all for crazy, pointless debates in a healthy and well intentioned and friendly manner. Here's how I read your reply:
You've suggested false equivalency, but I think that's flatly incorrect. I believe the equivalence I see is
[a set containing all roundel designs] is similar, but obv not identical to [a set containing all possible fonts including different sizes of font (which will be relevant later)]
Fonts are not sizes, they are designs. Sizes can vary but the design remains the same, as with roundels.
The roundel I suggest is a very specific image, not used solely for aeroplanes. It's the specific one used for the Mod movement of the 1960s, this makes is very much NOT equivalent to the other roundels. Did you know that the MoD tried, and failed, to trademark it? That's how significantly different than all those other roundels it is.