Short Answer - YES - an original idea at last!
Now whether you (as the originator of the idea) choose an IRC or ICQ or AOL is your totally choice...... and base language, again your choice - personally, I am happy with German French or English!
I assume this will be a live chat and as it (internet) it is also Worldwide and the time zones become irrelevant (for insomniacs) so that SH3 chats in realtime - with 'kindred spirits' can be achieved at any time - I like that!
I would suggest that there should also be a freedom to discuss all topics and aspects of the game and even it's historic environment - for all connected users .... perhaps whoever is on at the time steers the topic of the hour?