"... some sort of farewell emoji; the only one I could find was a waving hand."

How about 🙋 U+1F64B HAPPY PERSON RAISING ONE HAND?

You can also customise. Some examples:
🙋‍♂️ 1F64B 200D 2642 FE0F ♂️ [sex]
🙋🏾 1F64B 1F3FE [skin tone]
🙋🏼‍♀️ 1F64B 1F3FC 200D 2640 FE0F ♀️ [skin tone & sex]

And, no doubt, with your (much better than my) Segoe UI Emoji font, you could make them young, old, bald, red-headed, bearded, bespectacled, and so on. ☺️

"I had no luck rendering flag emojis"

Are you using U+1F1E6 REGIONAL INDICATOR SYMBOL LETTER A through U+1F1FF REGIONAL INDICATOR SYMBOL LETTER Z?

Some are obvious (like AU for Australia):
🇦 + 🇺 = 🇦🇺

Some are less obvious (United Kingdom needs GB for Great Britain):
🇬 + 🇧 = 🇬🇧

They don't have to be country flags:
🇺 + 🇳 = 🇺🇳

— Ken

In reply to Re^3: Perl Secret Operator Emojis ($A++) by kcott
in thread Perl Secret Operator Emojis by eyepopslikeamosquito

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