If you are with consultancy, run one more payroll so you have another month to transfer to F1. That may be your best option. Also why are you planning to go outside the country? Submit a adjustment first, get approved and then go for a F1 stamping. Here's some resource.
https://wings.buffalo.edu/intlservices/documents/ChangeofStatus-H-1BtoF-1LH3-12.pdf