Tan, it depends on what their foster situation is and whether they have fosterers prepared to work long term on a cat. Some fosterers love the grumpy ones.
I still believe they are assuming he's feral as what they are offering seems to be the standard TNR. And to be honest, until he's in the trap and at the vets a lot of the time it's hard to judge whether they will come round or not. Even then, some of them you think will come round with a bit of intensive work actually prove to be a lot worse once in care! I do recall one such Tabby I swore was a softee in the making as he was very good with his feeder, she could tickle his ears and even rub his tummy... but the minute we got him in a pen he turned into a Panther!
Turned out he only liked his lady whose garden he chose to squat in and on one else would do.
We took him back to her after 2 weeks and he still lives next to her bins and won't leave.
It's me who often makes these judgements about returning them in Canterbury as I mainly handle the ferals and I always allow two weeks for initial shock to go. If after 2 weeks they are still very hostile and it is plain to see we are doing them no favours by keeping them cooped up, back they go (so long as the environment is safe and someone is feeding them!)
You can expect him to radically change his behaviour when the hormones go... but be warned it can take up to six weeks for that to happen. He should become a lot quieter after that.
The kind of service CP offers does differ a lot between branches. So I can't say what your branch can or can't offer, only what WE would offer should you live in our patch.... it's ALL down to having sufficient volunteers interested enough in that particular niche of welfare work. If no one in the branch is interested much in trapping for instance, they can't offer you that and you will have to trap for yourself and do all the running around.
Other branches have really serious trappers and it's virtually a professional door-to-door service.
Also what contact they will maintain after returning a cat to site depends on the volunteers being prepared to do it... Again, you have to outright just ask them.
Do give either me or Sharon a yell offlist if you like, hun. We'd be glad to do whateve is in our power.