I need to change my custom empire diplomacy tree to add and remove certain things.

i would like to remove the darkling tech, and replace it with the unlikely friends and shrill tech. Also I want to remove the "otherside" and replace it with Dancing with dragons.

Also is it possible to make it so my faction can use both stables and wargs? And along that line what would I have to do to make the Umberdroth a mountable unit like a warg while preserving its attack stats(Along with its ability to be trained as a unit) along with allowing the additional stats of the rider to be added as well? If possible I would like the "Umberdroth kennel" to make 0.2 units per turn...

Any help with this would be great! And it may be out of my ability but its worth a shot...