Restore SQL Server DB encrypted by EKM - where's the asymmetric key?
If you're using an HSM, there would be no point to export the key in a situation like this. The main point of an HSM is to keep the keys safe, among various other things - so you really don't want to export the key.

First, I'm going to assume that on the server you want to restore this database to you've created the credential used to access the HSM and I'm going to assume you've allowed the addresses of the new server to talk to the HSM, and all of the other assumptions such as load the EKM DLL, etc. In that case, rather than specifying CREATION_DISPOSITION = CREATE_NEW you'll want to use CREATION_DISPOSITION = OPEN_EXISTING which is part of the CREATE ASYMMETRIC KEY T-SQL.