I'm afraid an open discussion with the group is impossible for a variety of reasons, including privacy and security and time (& 50% don't speak English). And I think we all know that the group's decision will be subjective, probably idiosyncratic, & apparently based on criteria unique to the group. (In the end it's just a bunch of people saying "I like that" or "I don't like that" ... has a faint whiff of democracy?)

I will however, report back (maybe August) on which tool was chosen, and perhaps why.

Thanks very much for the suggestions.
Hope there will be a few more.

I use this:

http://www.alcodasoftware.com/word-spring.htm

It will certainly do nearly all you want; although i'm not completely sure it auto-detects language change ... but it's very easy to specify languages.