Fwiw, Myanmar has been transitioning to metric since 2013 but, well, they had other worries. Likewise, Liberia set up a transition program in 2018. AFAIU both

Fwiw, Myanmar has been transitioning to metric since 2013 but, well, they had other worries. Likewise, Liberia set up a transition program in 2018. AFAIU both still use a bunch of traditional non US units too, like the UK.