Changing tech tree for just the player

I was thinking about making an Aliens mod where the player uses Geiger's Aliens as a race.

Because aliens don't have the inteligence to use guns and whatnot, their tech tree would be quite different from the standard.

Only problem is... how do i change the tech tree for the player without changing it for the AI?

Can it be done? Does anyone know how to do it?
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I might mention that other things, like invasion tatics for instance would need to be player specific.

Any rule of thumb for making aspects of the game specific for one race?