C:\Program Files (x86)\Steam\steamapps\common\sins of a solar empire rebellion\GameInfo
PLANETMODULE_PSIORBITALCANNON.entity
PLANETMODULE_TECHORBITALCANNON.entity
PLANETMODULE_TECHORBITALCANNON_LOYALIST.entity
CannonShellTech.entity
CannonShellPsi.entity
RESEARCHSUBJECT_PLANETMODULEACCESS_CANNONPSI.entity
RESEARCHSUBJECT_PLANETMODULEACCESS_CANNONTECH.entity
RESEARCHSUBJECT_PLANETMODULEACCESS_CANNONTECH_LOYALIST.entity
Those are all of the ones I see that have to do with super weapons, of course you would use PHASE for when the vasari come out assuming they still don't allow you to toggle super weapons.
If you remove these files you won't be able to play on ICO, and it may cause a crash if the AI tries to build them. I'm not an experienced modder, good luck.