Hey Chris,
I have used Biofreeze on clients. I'm an Ohio Licensed Massage Therapist.  It's a topical pain reliever like Ben Gay, Icy Hot and that sort. Another one you can try is Sombra which is made from capsaicin, the stuff that gives hot peppers their hot-ness. To my knowledge it won't numb the nerves in your head (I teach Anatomy & Physiology) or kill the headaches.

Having said that however, if it is helping with the headaches then I'd recommend seeing a good massage therapist. You might need to call around and find someone who specializes in Neuromuscular Therapy, or better yet, Muscle Release Technique, or one who also does PNF in addition to massage (Proprioceptive Neuromuscular Facilitation). 
It might be that the headaches are being made worse by tight muscles in the neck and upper shoulders.  I've often been able to give clients with raging headaches (not Clusters unfortunately) considerable relief in just 30minutes. Sometimes these clients get headaches so often it seems like they could be clusters but they're actually really bad muscle tension headaches.
During my cluster cycle I find that the massage I get helps considerably with the muscular tension that comes with the CH's. I don't think it shortens the cycle but, one time toward the end of a cycle I finally got a good night's sleep after an hour long massage on my neck - that was an unexpected (but pleasing) result.
I hope this helps!

Obviously it won't help with the cluster itself but as for the associated pain in the neck, temple and even the jaw line, I use something called "ActivOn".

The primary indication of ActivOn is for joint and muscle pain, I've used it for years for back and knee issues. However, about a year ago I started using it during cluster cycles and it does help. The only issue is that I overused it and actually burned my skin; almost like a sunburn.