The order in which the triggered effect resolves is not an issue in this scenario.
You choose the order when multiple abilities affecting your character triggered simultaneously. However, these effects are resolved in a wave and a character's destruction only occurs after the entire wave is resolved. As such, you may apply either the heal or damage effect in any order and as long as your character health is in the positive after the entire wave is resolved, it will not be destroyed.
This referenced post might be old but the rulings for it had not changed from the mentioned version of the CR. Have a look at the similar posting over
here.
Some people learn, some people don't. For me, I can never correct myself to say Julia Graves as opposed to Julia Roberts