im pretty sure you can get 2 day plates. my temp plate for my rover was close to a month (3 weeks maybe?) I swear to god the other day i saw a car that took a picture of a lisence plate and made it bigger, printed it and tapped it to the back of their mini van. I must have been seeing things.
The other option is to get one of them cool orange triangles for tractors and keep it under 25.