I'd say that you would have to catch the cat yourself. Then bring it down to them to get it fixed.
Hi! The place you posted this question is meant for questions *about* this business, and it looks like your question is one for which you want help *from* the business. Based on my experience with Affectionately Cats, I’d recommend calling them and asking them your question directly. (Most likely, they’ll recommend an animal rescue organization that would be better equipped for the catch-fix-release project you’re describing.)
Thanks! Your answer is awaiting moderation.