Potentially impossible cleartarget help/harm macro

You could always just stick Crusader Strike on a modified press.

#showtooltip
/cleartarget [mod:alt]
/startattack
/cast [mod:alt] Crusader Strike; [@mouseover,help,nodead] [] HELP_SPELL
/targetlasttarget [mod:alt]

So alt is CS, reg is your heal.