So,
there are settings to allow modification of notes after an order is process/closed.
If this is off, I can't interact with the notes at all, but if it's on, I can do what I like.
What I'd like is for them to be read-only, but to still be able to interact with them - e.g. to copy the content to send to someone (in my case it's transaction log information for a payment integration).
For bonus points, I'd like this setting to be dependent on the NoteType of the record, so that I always can make some active-but-read-only, regardless of the state of the order.