Carrie - based on the article Lisa posted and because I know you want to help are you are able: how about doing TNR on the Toms first. Maybe you could explain to your vet and even ask other vets in the area - and if they know what you are doing - may offer to neuter at a very low price for you. Could you get a few more people excited about this as well - folks that will understand what you are trying to do??
You can't save them all or protect them all - but every little bit makes a difference. I am thinking TNR Toms first - maybe others have better ideas...