Chucking the whole healthy to bloody and then back to bruised thing for dice means the entire way that health is measured in Heroes of Destiny is up for grabs. Not just health, but damage, damage recovery, and no small number of potencies. There's a whole web of interconnected concepts that need to change together.
Today, I'm dealing with the matter of getting your dice back. Wounding seems pretty simple. You take damage, dice drop out of your pool. That part can stay the same. 2 points knocks loose a Hope die, while a single point bloodies a Destiny die.
The question is, what happens then? How do you get them back, in the middle of things I mean? And make no mistake, you need some manner of recovery, otherwise this is just another death spiral game, and I know of few people who enjoy death spirals.
So, first things first: all dice of a type are the same. This means that all d6s in play act the same, just as all d10s in play are the same. What this means is that a die is in play or it isn't. If you recover a die, it's a full fledged member of your pool. You can roll it, but you can also use it to take more damage. Recovery means you're getting some of your damage capacity back too.
Now that we've got that, how do you get those dice back into your pool? An idea that one of my players had was to roll your injury dice (the ones knocked out of your play, bloodied to use the old nomenclature). For every die that comes up a success, you return it to your pool. Anything that doesn't come up 5 or better stays where it is.
I like that. It's pretty simple, and it uses the existing rules. Yeah, okay, there's an additional die roll in that, but it's not too bad, is it? Bears testing to find out; I'd like to keep additional rolling to a minimum, but this particular roll might work out. However, I'd like to add one wrinkle to this: recovery isn't automatic. You need to expend a little effort. So, on any given round you can allocate a single success from your pool to recovery. That lets you recover at the end of the exchange, and those dice return to your pool for use at the beginning of the next exchange.
That's complete enough to begin play again. I'll let you know how it works out.