Howdy
KFC the rooster
Your profile does not show your location but I am located in Aus.
Besides the already suggested advertising one option we have is take them to our local Feed Store which sells chickens also. For a small fee to cover their feed while they rehome them, they will take your rooster and try and find him a new home.
However, he still may end up being someone’s dinner which is sadly always the problem with unwanted roosters.
Anyways, it might be worth a shot to see if you have anything similar in your location.
We also have a few people with lots of land who advertise that they will take any unwanted roosters. Granted they also might end up on the dinner table but they are well cared for and have a pretty good life up until that point.
I am the same as you, I can not keep roosters but I also can not kill them myself which is one of the reasons I have very few hatches here; the rehoming of the roosters is always a dilemma