Every citizen should pay their taxes, which, in turn, buys them the right to be tax-paying citizens

I'd go for this kind of construction, where appropriate. Sometimes sounds a bit stilted (in fact it does here), but I can live with that.

Mind you, with just a little thought you can usually re-work PC sentences into something slightly more palatable:

"Every citizen should pay taxes, which, in turn, buys them the right to be called a tax-paying citizen"