It's more of a patchwork here than you seem to think. Driving through DC with ammunition or mailing mifepristone to TX, as examples.
CA would have to amend their constitution, but could pick a second language.
NY already prefers metric
AL could probably allow those marriages, they're not big on allowing marriages though.
UT would be stopped by the establishment clause.
https://law.justia.com/constitution/california/article-iii/s...