Using VWFRR in a cocktail would be a huge mistake. I guarantee you won't be able to taste the difference. For what it's worth, I'm actually reading this in the one bar in town that carries VWFRR and the bartender agrees. (I read SB while my cutie is powdering her nose.) Says he won't use VW for mixing, period.
I really don't understand why people even consider using rare/premium shit for mixing. But I'm obviously an absolutist on the topic. Still, I came to be that way listening to smart bartenders. This guy uses Ritt BIB, baby Saz and various Wellers for his unique drinks. One of the classiest "wells" in the city.
Not implying I would make a regular thing out of it... I just want to try it