The money-spending unwillingness is probably not on JR's contract (he's leaving with a year still left on it!!) but rather on lack of development of the ZX10R itself. The bodywork-redesign and minor engine update of a couple of years ago did not do what was needed.
Do those changes have to be done on the stock bike, or can they be done on the WSBK spec?
I don't know the homologation rules very well.