Hey @warrensbox,
I see you could achieve your needs by plugging personal-files, but it does not look like the correct approach. The personal-files interface, is typically used to provide read-only access to top-level hidden data directories within a user’s real home directory in order to support importing data from existing applications where the snap is the clear owner of the target directory.
Have you explore the possibility of shipping the desired terraform versions into your snap instead? (i.e., add to stage-packages (if needed you can add apt repositories), or even build from source?)