“Wanting to keep it simple” by avoiding having it “all installed inside the snap” is not typically a reason for classic confinement. The fact that you want to keep it private is interesting and you might consider a brand store so you can distribute snaps associated with your brand as you see fit (https://docs.ubuntu.com/core/en/build-store/). Please note that there are currently no controls for ‘granting classic when private’, but maybe that is worth considering.
@pedronis and @noise - can you weigh in? This is twice in a week that I’ve seen a classic request justified because it is private. (I’d like to formalize our response on the topic)