PS, and leave the Ferengi out of it.
Now if you could figure out a way the Dominion could make use of the Borg, you might be onto something. Can a Founder be assimilated? Maybe not. Could they figure out a way to immunize Jems and Vortas from assimilation? Or would it matter? Just have the Vorta termination implant set to trigger whenever nanoprobes are detected. As for the Jems, cut them off from the white and they die.
If the Dominion were the only force in the galaxy effectively immune from the Borg, wouldn't that be interesting?