Grace period extension for new auth system?

Hi,

we have a small app that is used by a few groups in the edu community, blind people and a few individuals.

It uses Dropbox as the only endpoint and therefor completely relies on Dropbox' services.

The app is simple in its feature set and flow and receives only updates when urgently needed (like the auth update a few years ago, and now another).

For several reasons (sickness, probable App Store review delays) we will not make the end of September deadline.

The app only makes sense with long term authentication, and would need to use the offline tokens anyway.

Is there a way to have the current auth scheme extended for the app for a limited time, so that we don't have user access cut off? Would be highly appreciated 😬

Thanks in advance
Stev_