Jade, I understand fully what your are asking for, but look at it from the cats point of view. You want someone to take this cat into thier home and allow it to get used to a home life, then take it back after a while where he/she will then be expected to live outside again. Is that really fair on the cat, hun?
Is there a reason that you cannot take the cat into your own home, it is not ideal for a cat o live outside during the winter, especially if we get another one like last year.
I for one, would not like to take a cat into my home that has been living rough with no vaccinations, sort it out, the poor wee thing gets used to a home life and then I am faced with the prospect of handing him or her back knowing that the cat will have to live back outside again. I am afraid that none of us will do that for the cats sake.
You say that you want to devlop love and care for the cat and you think that you could look after the cat well, but she has been around for a year and still kept outside. Take up Debs offer, rescue spaces are at a premium this time of the year and if you umm and ahh too long, then you will find that there are no spaces for your cat. Think of the cat, please.