Tweeters on the older Wilson models and on the Sabrinas are very different. The W/P 8s that date back to mid/late 2000s used inverted titanium tweeter. Hotter sounding than the silk dome tweeter Wilson Audio implemented on the Sabrinas. With BAT you may end up taming a bit more than you intended.
+1 @audphile1 I was no fan of those inverted metal-dome tweets Wilson used to use, and agree the BAT was probably taming them enough that I could finally enjoy listening to them but may well make the Sabrinas sound too rolled off up top, unless that’s what you’re looking for of course.