Whoop, thanks y’all. Travelled to Austin again, and took the p/eSIM leap on X10III.
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overnighted a 9esim v0 pSIM from Amazon
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installed 9esim app https://play.google.com/store/apps/details?id=ee.nekoko.nlpa.flavor1&hl=en_US on companion-backup LineageOS XA2 (surprised to discover Google Play Store developer account is registered to an Estonian
company, with 5000 € annual turnover and a very non-Estonian named owner: Hongchuan Sun) -
signed up airalo.com (friend recommendation, and also https://www.reddit.com/r/Airalo/comments/1mw1nte/comment/n9ya6fg/ cc @nephros thanks for routing heads-up, I would not have thought of it)
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for US eSIM, Airalo is definitely more expensive than esim.cc linked from 9esim.com top-nav: 10 GB / 30d plan is $23 vs $13 - maybe one day I’ll know better what I’m paying extra for here
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9esim app: scanned QR code, basically clicked next next next, profile ended up on SIM: I saw a French flag somewhere in the “display info” panel
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removed uSD card, swapped p/eSIM to X10III SIM2
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SIM2 connected on T-Mobile with no apparent problem
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followed Airalo’s APN instructions for
wbdatafor “Data access point” name field
Great success?
EDIT now installed SimPro from openrepos, which also seems to have matured to a state where you perhaps don’t even need an Android phone to work with!