Try the FAA designee database
https://designee.faa.gov/#/designeeLocator
If you fancied taking your chances in the US you may enter using an M-1 student visa to complete something like a CFI-IA course. The practical test will reinstate the certificate and any included ratings. Only a 2 day wait for visa appointments at the embassy in London right now. A hard copy of the I20 is no longer required. Things don't look too bad in the northeast:
https://www.covidexitstrategy.org/