actions on hotkey press and/or release?

[Ualaa]

Find the mapped key, in General, "FTL Target Me".
Copy it, and then Paste it.
Rename it to Healer Target Me, or something similar.
Change the target of the new key, so it only affects the Healer on your team.

Make a new Mapped Key.
Either put it into General or a Keymap made specifically for that team.
Give it a hotkey.
Set it to execute on press or release.
In Step one, have the Tank character use:
a) Do Mapped Key Action > Healer Target Me. (Target: Tank Character).
b) Send the Healer, their warcraft keybind for Instant Cast Heal (of choice). (Keystroke Action > Target: Healer Character).
In Step two.
a) Keystroke Action > Target: Paladin Character... whatever keybind you have for a warcraft macro which casts WoG on the Pally.

Export to Inner Space.
If you're in game, /console reloadui


Give it two Steps.