Many of the US courses and schools are not accepted by foreign Maritime Authorities, unless they are STCW compliant and IMO approved.
I believe the courses held by RelyOn NUTEC USA is accepted by most foreign authorities. (Not sure about this):
https://relyonnutec.com/articles/2019/3/falck-safety-service-is-now-called-relyon-nutec/
PS> This will not help OP, since RelyOn NUTEC is about safety training only.