I recall there being a special room in clockwork tunnel levels in which you choose between health boxes or treasure boxes, why not do a take on that with your emergency revive?
-It would encourage team play a little more and reward smart gameplay.
-Going into danger rooms without your emergency revives would be a good way to burn these sparks that I'm getting in surplus as well. (A light joke, I realize not everyone has sparks to spare.)
-Those treasure rooms with multiple energy doors would require multiple knights to open, encouraging parties.
Yep, great idea. I was thinking on this earlier, having lil gate keys drop from boxes in the clockworks to open gates in the clockworks, but the energy revive would be excellent, a simpler option than specific keys, and one that would indeed help team play as well as offer some risk. Perhaps they would need to call it Spare Energizer or something similar, to keep terminology in the spirit of things.