Jason-
I'm sure that some are going to disagree with me, but I'm of the opinion that snakes should always be fed in their enclosure... especially a particularly large burm like yours. This is for two reasons: The first one is the dilemma you're referring to in that you'd need to get her (I'm assuming it's a female) back in to her enclosure at some point after she's eaten. This can be at the very least tricky, or at the very worst downright risky. Reason number two is that I feel when the cage door is opened, a snake should expect to either be fed, or come out. That way you can distinguish between the two (patting on the back, rubbing with a hook etc.) and avoid a situation where she might confuse your hand for food. If you're taking her out of the enclosure in order to feed her you'd be muddling that line and in my opinion, increasing your chances of getting bit. Now I don't personally keep any of my burms or retics on cypress mulch, but I do keep my bloods on it and have been able to feed them in the enclosures without any accidental mulch eating. I just put the prey item on an upside down rubbermaid top and set it in the cage... kind of like a dinner plate. I imagine you could do the same with a large burm in a large enclosure and get the same results. Hope this helps and hurry up with those pics!