Instant Shield swap in death box by button

Best thing ever to improve third partys would be to assignate a button to instantly swap shield from a death box, I am a ps4 player so would love to be able

to swap shield from a death box by hitting the triangle button. During hot fights every second counts and a button to swap shield would be a huge help, push it another time for reswap if shield was empty for example this can be done in a tenth of a second.