Include text in custom alert message - workarounds wanted

I'm describing a feature that doesn't yet exist. Where the state change of an alert (null -> open, open -> ack, open -> close, etc.) could trigger scripted actions, the result of which would be fed back into the alert (or linked from the alert as a child object since you might have it run multiple times). 

Groovy complex datapoints would be a workaround, yes.