6SJ,
I like your approach, but it preferentially chooses numbers (one of 10 symbols half the time) versus letters (26 symbols the other half of the time).
An alternative for RANC:
=CHAR(IF(RANDBETWEEN(1,36)<11, RANDBETWEEN(48,57), RANDBETWEEN(65,90)))
EDIT: Or
=MID("0123456789ABCDEFGHIJKLMONPQRSTUVWXYZ", RANDBETWEEN(1,36), 1)
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