If you find a way, I am going to break it. It is an extreme balance problem and craps all over the realism, too.
I don't want to be rude nor insulting, but basically you're taking the D-Bag mentality way of dealing with people who come up with innovative ways of having fun with the game? O_0.
What if a person can't find the items he needs to create your version of Deuterium and Tritium, but CAN build the machines necessary to create the GregTech version. You're going to deny him the pleasure of enjoying the game the way he wants and force him to hunt for your items (and forgive me if I sound rude, obnoxious and arrogant)? Isn't the point of this game to have "Fun"?
Have you ever built the machines necessary to create GregTech's versions of Deuterium and Tritium? I have, and it took a LOT of time, TONS of resources and LOADS of patience to retrieve your belongs when you died because a Creeper blew up next to you, you gave the machines too much power and they exploded, or you died of hunger because you were focused on building and not eating.
I know you want realism and stuff, but it's a game and the point of this game it to have fun.