Well, Good 5.0 is out and it now works with WM6 and the 6800. All you need is the 5.0 OTA from the
https://get.good.com site and your Good server should already have access to the 5.0 Client to push, even if your server is running 4.9.3 still. I just installed it on my 6800 and it works like a champ. I will be testing with 6700s and AKU 3.5 - WM6. but I am 99.9995% sure it will work.
http://customerportal.good.com/techSupport.php?id=70