Do you know if they check with the original issuing authority, or do they just take what's written in the license/cert of reval?
I ask because I do now have a signed certificate of revalidation from a Dutch examiner. So if they accept that then great. But if they call the CAA who say "no it's expired" then it's not good. In any case I think for the long-term it's necessary to get it converted. And if my Dutch examiner at the flying club here can just do some circuits with me to renew my SEP then fine.
Nothing is ever simple in aviation is it? :-D