That encryption is pointlesss. North Korea can just demand the key and decrypt your data (assuming the company has presence in that country). Very few services have true end to end encryption. Currently it's not even feasible for healthcare data (homomorphic encryption is not practical yet).
For North Koreans, all encryption is indeed pointless if the goal is to hide it from the government, regardless of where they want to store data, for this very reason.
I can implement true end-to-end encryption in about 30 minutes (only because I gotta look up where I implemented it last). I will encrypt my data using well known and validated libraries, send it over to the cloud. Retrieve when I need it and decrypt it then. Not sure what about this is not feasible.
What use is end to end encryption for your healthcare data, if nobody except you can process that data? In that case, why don't you just put it on some external hard drive?