I can almost guarantee the TSA will invest zero dollars or time into deciding which MacBooks are okay. This is Apple's problem to solve. Zero time, money or attention from the TSA or the airlines will be invested. If the FAA bans any Macbooks, all "Apple looking thingies" will be effectively banned.
Source: 3 decades of govt and airline experience.
Advice: Buy a Dell sticker to cover the apple logo on your MacBook. Or some similarly silly thing like an "Apple Store FAA compliant sticker" program. (I'm linking back to this comment later when it happens :)
If the search is only 5% effective then the deterrent needs to be something you wouldn't risk a 5% chance of happening, year in prison, or a fine of 2 times your average annual income seems about right?
how is it apple's problem then? by the way you've described things, it doesn't seem like it's anybody's problem. it could be a marketing problem for apple, but it doesn't seem like they care about those anyway.
Or do you really think this list (https://www.tsa.gov/travel/security-screening/whatcanibring/...) wasn't influenced by the FAA? Note quotes like "For more information, see FAA regulation: 49 CFR 175.10(a)(4)."