My DB coach said boundaries are to keep things healthy but not restrictive. I think in this case a financial separation would be effectively letting her feel the loss without being punitive. You can tell her that it's not working for you. What is your end goal? How does it look? What will bring you closer? Seeing a future between you and your wife is one way of enduring the marathon of DBing when the WAS/WS is still floundering. But in the meantime it is not unreasonable to expect your wife to support her separate living arrangement, it may bring into focus real life when it comes to leaving her family.
M 10yrs T 13yrs BD #1Oct 2015-PA between WAH and COW BD #2 April 2016-WH resumed PA, she broke it off Jan 2 2017 WH says he wants divorce April '17-Letting go 2018 D busted DD8, DS6, DS3