Since I decided not to bother with making a fission reactor, I have a big-ish stock of Uranium taking up space in my chests. Would it be possible to make a machine that takes the water cells and lets the Uranium pumps its neutrons into them to make the Deuterium cells? I also didn't much care for the low ending output of the deuterium extractors, or all the empty cells to manage. I know this isn't quite how it works, Wiki says that's more for Deuterium to Tritium, but this is Minecraft, accuracy need not apply.
I had two ideas on how it would work:
put the uranium cell in the center, have a ring of water cells surround it. Wait a while while the fuel cell ticks its way down to depletion, while the water cells become deuterium ( perhaps with a intermediate stage or something)
The other one is more like a furnace GUI. put uranium in the bottom, water n the top, deuterium comes out the side. It'll consume the whole Uranium to charge the enrichment bar enough to do maybe 8 cells at a time or something.
I'm no Rocket Scientist
see what I did there?
but I think it would make more sense for the Uranium thing to yield Tritium or Helium-3, which are radioactive, unlike deuterium.