If you don't spam it too fast, something like the macro I use for cleansing should work pretty well, and adding more commas would let you spam it faster:

/castsequence [target=player]reset=5 ,,,,Remove Curse
/castsequence [target=party1]reset=5 ,,,Remove Curse
/castsequence [target=party2]reset=5 ,,Remove Curse
/castsequence [target=party3]reset=5 ,Remove Curse
/castsequence [target=party4] Remove Curse

With the various party# replaced with toon names, and you can add commas on the other side of the spell name to be extra sure it won't recast it on any of them if you have room and added the extra commas before it.

This macro is based on the principle that the earliest sequence currently at a valid spell will fire first at each press of the button.

Making it /click based with one or two castsequences in each, would give you more room to make it however you want, if you are not using macaroon or a similar addon to get extended macro lengths in the first place.