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The WLCSP is even tinier pitch! I was thinking maybe I could superglue the chip to a board balls up and dead-bug it?

Thanks for the explanation of "commercial-grade" as "not automotive-grade"!

I think the usual technique for soldering a BGA is a lot easier. https://hackaday.com/2021/02/28/bga-soldering-and-inspection...

At the bottom of the page you'll see a link to someone who followed your suggestion. Now that looks hard. :)