With your airplane mode suggestion, you had my heart pumping. That would have been great to contain the broadcasting. But, sadly, when I turned on airplane mode, it turned off the 8a's hotspot.
For what its worth, I use a common SSID "xfinitywifi", using some Unicode "homoglyphs". Characters that look similar, but have a different character code (copy "xfinitywifi" between the quotes and check it out). Also I use the full 63-character limit of random characters for the hotspot password. Also check out Password Tech (https://pwgen-win.sourceforge.io).
Bazzell consults to celebrities on privacy & communications. I've benefited a lot from his book.