Is the guid you are talking about master.sys.asymmetric_keys.cryptographic_provider_guid?
The only way to change that would be to change the system catalog directly, but I am not going to say how to do that, because it would render you installation unsupported. And most likely it would not work.
You need to rotate your TDE key. If you don't want to decrypt it before migrating to the new server, you will need to have both providers in installed for this operation.
With the same caveat as before: I have never worked with EKM. What I'm saying is based on common sense and reading between the lines in the syntax.