I was thinking about this, and maybe using a depleted cell would be more interesting. That way you have to burn that fuel cell for power, so you can't make the nuclear reactors obsolete.
I have always looked for a use for the depleted cell. It did cross my mind to use it for this, but i was worried it would be soooooo hard to mass produce. you would need more mechanics to use the uranium cell. I like that we are on similar wavelengths though.
I mean. Nuclear ships output a lot of that stuff, and reactors burn it even if you don't use the heat.
Only thing I'd do is make the spent cell easy to launch.
I had more ideas for this, but is on the shelf for now.