Have I said how I hate these forums? I was going to edit, but then remembered that the Edit capabilities are the megasuck.
Anyway, I only mentioned the Hacan/Trade II above. Here's how the other races would fare:
Xxcha/Diplomacy. They can use the Primary instead of the secondary, to do what the Primary would do. If they choose the Annexation option, basically, instead of paying 1 CC and 3 Influence, they are only paying the 1 CC (to activate the secondary-which-becomes-primary).
Jol-Nar/Technology. They also can use the Primary and the Secondary. They could just get the free Tech that way, get a free Tech and a 6-resource tech, or get THREE techs by getting a free Tech and an 8-resource Tech via the primary, and a 6-resource tech via the secondary (as long as they can pay for both).
Winnu/Technology. It doesn't matter what version is used, they can activate the secondary without a CC.
There are a few Action Cards (and I think a couple Political Cards) that aren't really usable with the S.E. expansion strategy cards. Basically, those that refer to the Political strategy can't be use. That being said, a few of them (like Determine Policy) can be easily adjusted to work with S.E.