Sounds like you'd have to test it to be sure; I find the longer the macro the more often it doesn't work properly.

FYI, you can shorten all the 'modifier' tags to 'mod', Warcraft treats it the same (should save you a lot of characters if your pushing the 255 cap).
Also, not sure you need the 'exists' tag after each 'help'... since if the 'help' passes the true/false check then exists is already determined for the healing spell (however if the target is friendly but dead you may have an issue)

i.e. /cast [modifier, target=focustarget, help, exists] can instead be /cast [mod,target=focustarget,help,nodead] which has the same result with fewer characters.