library A requires TimerUtils

struct s
    effect fx
endstruct

private function f takes nothing returns nothing
    local s ew=GetTimerData(GetExpiredTimer())
    call DestroySpecialEffect(ew.sfx)
    call ew.destroy()
    call ReleaseTimer(GetExpiredTimer())
endfunction

public  function TimedEffect takes effect fx, real time returns nothing
    local timer t=NewTimer()
    local s ew = s.create()
    set ew.sfx=sfx
    call SetTimerData(t,ew)
    call TimerStart(t,time,false,function f)
    set t=null
endfunction

endlibrary

like this
call SaveEffectHandle(h, i, 0, sfx)
call SaveEffectHandle(h, i, 1, sfx)
call SaveEffectHandle(h, i, 2, sfx)

library A requires TimerUtils {

struct EffectContainer {
	effect fx0
	effect fx1
	effect fx2
	
	static thistype New(effect _fx0, effect _fx1, effect _fx2) {
		thistype this = thistype.create()
		.fx0 = _fx0
		.fx1 = _fx1
		.fx2 = _fx2
		return this
	}
	
	void Delete() {
		if(.fx0 != null) {
			DestroySpecialEffect(.fx0)
		}
		if(.fx1 != null) {
			DestroySpecialEffect(.fx1)
		}
		if(.fx2 != null) {
			DestroySpecialEffect(.fx2)
		}
		this.destroy()
	}
}

private void f () {
	EffectContainer ec = GetTimerData(GetExpiredTimer())
	ec.Delete()
	ReleaseTimer(GetExpiredTimer())
}

public  void TimedEffect(effect externalFx0, effect externalFx1, effect externalFx2, real time) {
	call SetTimerData(t, EffectContainer.New(externalFx0,externalFx1,externalFx2) )
	call TimerStart(NewTimer(),time,false,function f)
}

}