I recently gave an update regarding the Kopano apps in Kopano4UCS in 4.4-8? - #4 by fbartels. Your list reminds me however of one thing. The WebMeetings app will not be updated for UCS 5.0, since WebMeetings has been replaced by the Kopano Meet app.
To be honest I don’t think it would be a big loss, if this app would not be updated for 5.0. There are plenty of easy and more powerful tools to get certificates from lets encrypt by now. For example the current app only does http verification and cannot handle wildcard certs. A better alternative would be to use lego instead.