As your post makes it clear you're not opposed to them being processed, sometimes it's helpful to think outside the box when looking to rid yourself of those extra males. For example advertising them for pick up by someone who chooses to feed a raw diet to their pet dog, or someone who does wildlife rehabilitation, etc can all be ways to be rid of excess birds without having to process them yourself. Just be sure you make it known that the birds are being given away "on the hoof" so takers know what they're getting into