I think that's an excellent plan. AND on top of it, if you don't think the note is good enough to really get the point across, or makes it clear how you're feeling, you have a few days to work on it and correct it. I write things like that just before bed, when I'm in this weird fog, and when I wake up, they make no sense. So it can be beneficial to read it again a few times as though for the first time.
Good luck, and nice seeing you in chat last night. Hope I didn't say anything foggy