Hello, indeed we are very aware of Euro-Office as our parent company XWiki has been involved from the inception of the project. We are already contributing our insights and experience as we have been working with the OnlyOffice code-base for years for the CryptPad integration.
We do plan to switch to Euro-Office in future and to contribute code to the project more directly, both for the integration in CryptPad and upstream. We don't yet have a clear timeline for this but we expect to have fully switched to Euro-Office some time in 2027.