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EUD will only function on preplaced units. Removing is stupid, since hotkeys and such get messed up. I suggest using one hero and giving them upgrades, changing units is unsitely, removes hotkeys, and generally just messy. EUD actions were patched anyways, you can only use conditions at this point.
No imagination
I did say its easier to move the unit to another location instead of removing it.. when u transform back u stay with same life, and the hotkey doesnt change if its same unit.
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If you need to life to stay same and all that, would make much more sense to use a burrowed lurker or something following you around (it would slow you down though) I wouldn't recommend using EUD conditions to change HP for other unit since that would be WAY too many triggers, and it could be very buggy since the unit numbers could change with all the creating/removing.
I dont know the first thing about EUD, sorry
I need someone to teach me