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For the sake of anyone else trying to achieve the same end, I'm updating my progress. I managed to achieve local encryption of a profile and its associated notebooks, but was not able to sync them.

I set up a separate profile which is protected by a VeraCrypt container. The container needs to be mounted before changing profile, otherwise the profile, or Joplin, won't open. Once the container is mounted, Joplin will open again. VeraCrypt provide detailed instructions on how to do this.

Using the link ajay provided above, I found this command to get the 2nd profile to store its notebooks in the encrypted folder mounted on volume J (in my case). mklink /J C:\Users\user.config\joplin-desktop\profile-xxxxxxxx J:\profile-xxxxxxxx

I was unable to get the 2nd profile to sync separately, either to the same server as the default profile, or to a different location. It will sync to the same location as the default profile, but the notebooks are duplicated in both profiles. There doesn't appear to be an option to use a different password for each profile.