x86 assembly isn't something I'm familiar with (and I should really get back to $dayjob), but I will mention the existence of emoji-test.txt [1] in case somebody wants to try and mine more executable sequences. It might be worth paying attention to the minimally-qualified, unqualified and component lines, which can be added and removed semi freely. No idea if they actually correspond to useful byte sequences.
[1]: https://www.unicode.org/Public/emoji/latest/emoji-test.txt
I think blogpspot unfortunately mucks with the emoji.
It's less to do with browser versions and more to do with websites. Mastodon and unfortunately blogspot seem to mess up the emoji. Fortunately you can click on the disassembly links that go to my disassembler and copy them from there.
Probably wouldn't hurt to specify the text editor too and settings needed to match the intended file size as well.
With the exception of (sigh) newlines, I surely hope your text editor accurately records the characters you paste into it. This job isn't different just because the characters are strange, multi colored ligatures.
Edit: As long as you work in UTF-8 that is, but you have to go out of your way to use any other encoding as an interchange format these days, even if alternative internal encodings aren't uncommon-
Missing emoji should still be copyable though, it just won't look as funny.
Every single one works. Apple keeps their emoji list pretty up to date.