So I went in and talked to the local Honda service adviser today. He started out with a canned speech designed to persuade me to continue driving the vehicle - 'the problem vehicles are those located in Florida and other humid climates, blah, blah, blah'. When he finished, I pointed out that Honda did not include any geographic limitations in their letter and, in fact, sent the letter to my home in Michigan. He then changed to the canned speech for rental vehicles
They will pay $35max/day for a vehicle ("whatever is available that day") from Enterprise. I have to leave my vehicle at the dealer. I then went to Enterprise and told them I would need a comparable vehicle, not a "whatever's available". They said no problem if you're flexible on the day to pick it up. They will get me a small SUV at the $35 rate with unlimited mileage (I drive +50K per year) sometime next week.
I figure having the rental will put me at the top of the list for parts when they become available since Honda won't want to pay the rental fee any longer than possible.