Auracast is basically what you're after but not out yet. I think a couple of transmitters and a headphone splitter is your best bet. There are products like this but you need to use their headphones and figure out power for the transmitter. It is USB C though, looks like a power bank would work.
Great q. I think if someone's even the tiniest bit bicurious it's it's conceptually the safest possible way to experiment. I imagine. Definitely gay though yeah. And somewhat incestuous.
Day of the tentacle on gp32 for me.