I'm pretty sure Galacticraft has a hard mode configuration option. I think this would be a good addition to it if there is one.
Basically - If you are on let's say the Moon. You just landed. You haven't gotten the fuel out of your lander yet. After spending some time on the Moon you suddenly see a warning telling you about the fuel leak. You take the fuel out of the lander and fuel your rocket up immediately and blast off and return to the overworld.
Basically - If you are on let's say the Moon. You just landed. You haven't gotten the fuel out of your lander yet. After spending some time on the Moon you suddenly see a warning telling you about the fuel leak. You take the fuel out of the lander and fuel your rocket up immediately and blast off and return to the overworld.