With that logic (associating your hand with food if fed in the home enclosure), consider this:

Since you are probably going into the enclosure on more days than just feeding day, the snake isn't going to associate your being in there with just feeding time.

However, if you feed in a separate feeding enclosure, and the only time it's moved to that enclosure is to be fed, you're more likely to be bitten when you move it to a separate enclosure, because feeding is the only association that your snake has with that separate enclosure.

I've never fed in a separate feeding enclosure. I feed ~ 40 ball pythons a week, and I've never had one mistake me for food on a non-feeding day. I have had some that KNOW that it's feeding day come flying out of their tubs when it's their turn to have food offered in anticipation, but never had them do that when food wasn't being offered.