Have you tried this? Support was added from Watch Series 3 and up.
https://esim.ninja/blog/how-to-activ...n-apple-watch/
For the record, went to Flow today to register an esim, there were no problems, the process maybe took about half an hour, paid $400 and we were done.
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Better late than never. Too bad my phone can't use esim and regular Sim at the same time. Has to be one or the other. I should probably buy a new phone.