The short answer is no, and it's due to the link between Fitr and Stripe. Once your program it's linked into Stripe as a one off download, it's not possible to switch it across.
However....
You can easily save all your programming in your fixed length program as a template.
Click here to see an article on template - https://intercom.help/fitr/en/articles/4100792-use-templates-in-my-programs
Thanks
The Fitr Team.