An idea that just hit me...
1. Give the player a unit for each level they make. (Can use Death Counters, but it's more complex in this case, so I won't)
2. When they go to heal, set the unit's HP to 1%.
3. For each unit they own, give 1 of them to a comp and add 1 to a Death Count. When done, return all the units.
4. Create a Medic at the location where they heal.
5. When the counter you set in #3 runs out, finish the heal and remove the Medic.
There you are, a custom HP system for organic units.

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