Colonies need to be placed close to spice, so placing them on planets with no spice is impossible.
Colony packs won't work if there's already an empire there, and the game would break, as that hasn't been coded in.
So either way, there's nothing we can do about it.

I like the idea too.
I will try to make it as soon as possible.

Can somebody make a Grox archetype mod?
Not just the background + voice.
You could replace the Knight archetype with it.
It would have the background, voice, and a superweapon, which would be infinite Planet-Busters.