Thought I'd relate this:

I've been feeding my two ~20 year old BPs out-of-cage in cardboard boxes for about a year or two now. While I will say the feeding response can be intense and nerve racking (to the point that I'm considering abandoning this method), one thing that has helped is laying a pillow case over them for a couple minutes before trying to pick them up and put them back in the enclosure. I've found that blocking out the light for a bit seems to make them sort of "shut down", and then I can go and pick them up with the pillow case still covering them, and they've never struck at me that way.