If you’re not doing any hard riding on the commuter, it might be worth replacing the rotors and leaving the drivetrain as is, depending on if the drivetrain is already very worn.
You’d have to monitor the chain since you don’t want it snapping on you; I’ve seen chains worn beyond 1.5% that still function. You might be able to save up for replacements in the meanwhile.
That was my thought too, and I also thought that if I were to sell it it's better to say "it works but the drivetrain is on its way out" than "the brakes are fucked so it's not really rideable".
If you’re not doing any hard riding on the commuter, it might be worth replacing the rotors and leaving the drivetrain as is, depending on if the drivetrain is already very worn.
You’d have to monitor the chain since you don’t want it snapping on you; I’ve seen chains worn beyond 1.5% that still function. You might be able to save up for replacements in the meanwhile.