I think that there is such division in the Lord Ranks, perhaps it could be voted upon?
Personally, I think we'd need permission to destroy Tython in such a canon altering manner from the Admins and such, and correct me if I'm wrong, that would increase the necessary post count to do what you plan to on Tython.
I already know that Zambrano the Hutt won't be involved in the dominion, since he is repulsed by places that remind him of the Jedi (then again if we're corrupting it, maybe he'll learn to hate the temples and seek to destroy them).
Further more, we already have our Malachor V in Brokellia... shouldn't we be focusing on capitalizing off of that anyway? There's a Rift to the Netherworld, and half of it is an entirely different planet from a galaxy none of us have experienced, with technology that probably pre-dates most the galaxies civilizations and orders. I would say we have our hands too full there to execute much of anything planetary on Tython, which is a handful to even find, let alone dominate in this way.
Personally, I would leave Tython untouched. Keep that solid red ring and mock the Jedi, that they can't reach their temples. Then slowly, over time, send expeditions to convert what little population remains there into unspeakable dark side creatures and vongspawn, sack the temples for useful knowledge, and purging anything within it that is heresy. I also think, that we should save it, until after our next invasion. That way, we can tell the Jedi, either in Victory or through the odd far off chance of Defeat, that we have found Tython... and we're going to burn it to the ground and reclaim it under the name of the Dark Lord to become the new Homeworld..
That's just me though...