Company is the group part of heroes. It isnt a full account intergration like the Heroes system ( company system + achievement/quest part/craft etc).
Character transfer should be possible with the Ankatractor(?) Easiest way for them to identify and confirm if 6 accounts belong to the same person.
I believe in Azaels book #5 he mentioned they were working on it.
By using the ankatractor + whatever transfer system they have it should be possible.