I'd recommend putting the strays in the same room as the fools who don't spay/neuter their animals. Put the people who have 'outdoor cats' in the room as well. Tie them up and let nature take care of them when said nature gets hungry.
In truth, your options suck. I spent several years in the same situation. If it's any consolation, you're saving them from a mangled death if struck by a car, or a slow starvation.
I'm hoping your brother was 3-5. Anything after that should have been slapped out of him.