Welcome, Will! Looks like you're planning a great trip. I completed a very similar one back in June-July of this year (17) - hitting all 48 contiguous states! Managed to do it in about 11K miles but would have really preferred to do it in 15-18K to allow for more "back roads" driving.
I can't offer much assistance in the technical arena as I don't own a M3Wer - but would love to give you my .02 regarding interesting stopping points, etc.
Reach out with a message or email and maybe we can exchange phone numbers! Depending on where you're coming in FL, would love to link up and talk Mog's - also have a few rental properties you'd be welcome to for as long as you're here. No charge for Morgan enthusiasts!