FTB, I think you'll accomplish more with your wife if you calmly and rationally sit down and discuss together why you do not want to contribute to the WTBTS.
Explain your reasons and be sure to state to your wife that, as a couple you understand that she has a right to participate in this decision.
If you just make a unilateral decision it will almost certainly not get you what you want. You may keep a few dollars or złotys or whatever it is where you live out of the hands of the WTBTS, but you may lose your wife in the process.
Oubliette