If you are going to make the tomahawk do it, why not turn it into an Ordos deviator? That way you don't have to send infantry to capture the vehicle, you just fire the missile at it and it takes over the vehicle.
Check out the deviator in my Dune II themed test map for Zero Hour, the scripting has some problems so you won't ever finish the game (can't get win condition to register), but you can see deviators in action, spice blooms, etc. Just look in the map.ini to see how to mod the tomahawk missile into a deviator one, this is a map.ini but you can make it into a separate secondary weapon in a mod easily.
ZH: Dune 2 Mod idea - CnCMaps Map Editing Forums