It might get some people into the market, but your vendors/suppliers won't like it. It will kill the custom parts market. It really should probably be used in the workstock class. It would keep that class level. Possibly the 2.6 class, but realistically the workstock class should be the one where the claimer rule works.
What you have to watch out for is the guy that just comes and competes and wants a new charger. In the 2.6/2.8 class you will severely limit the HP on that class, probably make the 3.0 class grow by leaps and bounds. Instead of a claimer rule you could almost go to a specific charger for the class, because essentially that is what you are doing. If the claimer rule is $500 protest, your pretty much only gonna have people putting $500 into the charger.