If you're a Founder Elite, you should now (I hope) have the Mercenaries expansion added to your Steam account. We've not done this before so let's try this and see.
Go to your GalCiv III item in Steam, right click and go to betas.
Type: ToriansArceansMercs as the password.
This should unlock the beta of 1.6 which enables Mercenaries. Maybe.
Let me know if this works.
NOTE: ENGLISH ONLY!!!!!