You can easily make a hydropocinic module so any space stations are permanent, it doesnt have to be a time bomb, and the game is already hard, like Ive said before you could just give the command pod enough food by default for a return trip to the mun, and remembering life support is pretty intuitive to new players Id imagine.
Ive messed up so many missions because I make a probe with no solar panels and it runs out of battery, I make a return vessel and forget the parachute or heat shield, vessels that need to be docked and I forget the docking ports on one of the vessels, forget reaction wheels and lose control, adding life support just increases the early game difficulty very slightly for the new players, but makes crewed missions so much more distinct from probes and so much more rewarding especially from interplanetary missions which arent done by total beginners anyway