You don't need anything to "allow for" a course change - its all Newton's 3rd law: every reaction has an opposite and equal reaction. So you throw some propellant out with a force of 1N, your ship'll experience an equal force in the opposite direction

why do you need to throw something outside the ship?
why not just throw it out inside the ship.

the same reaction would occur.

and you still have your propellant.

you would only need a compressor and a nozzle that vectors
inside a compartment that has a lower pressure than the compressed propellant.

and you could use nitrogen , its safer you could actually breath it and its innert. so non flamable.
3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.