I think if you explained why you would want to use the above you would probably get some helpful suggestions as there are some very knowledgeable and experienced people who post here.
Be better off with a cavesson and a martingale then. Grackle won't be doing much. Then do lots of schooling, outings or de-sensitisation work to stop the excitement levels escalating - make whatever it is that is so exciting so boring instead.
Also, would it be worth checking that you're not tensing and accidentally pulling back when she gets anxious and the bit is hurting as a result - I'm not suggesting for one minute there is anything wrong with your riding btw - I'd be the last person to do that. But if the bit was moving in her mouth and causing pain when she gets excited it might be making her throw her head up.