Ask HN: Who else owns a European Messenger chatbot?

I have many clients with Messenger chatbots integrated on their website.

One of them sent me this news of Facebook announcing major updates of Messenger API: https://developers.facebook.com/blog/post/2020/12/04/upcoming-changes-messenger-api/

All of important chatbot features such as OTN messages, persistent menu, embedded videos, carrousel?... should be broken on December 16th. The few information I could find is that there's not solution for now except spending dozens of hours modifying everything into text and generic button...

Obivously all of my clients are based in Europe and I built their chatbots with ManyChat and Chatfuel.

Is there someone here in the same case? How are you managing this situation?