When I get the so-called "VapEr's tongue" I can't help but visualize the end-flap of The Cat In The Hat: "NOW is your tongue numb?" The spelling of "tongue" and "numb" gave me issues for years... until I actually started school and started learning all about the glorious weirdness of the English language.
I also don't go for that 'vaping all your crap-tasting juices'... if it's crap, it's always crap, even if it tastes like different crap! Seriously crap juices sit in the cabinet until I need the bottle... then they go down the drain and the bottle gets washed and re-used, hopefully for something less crappy.

When I get that mysterious ailment, I usually vape a coffee/tobacco DIY; it's not terribly sweet, but it's a strong taste, and can get thru the fug, and helps to reset my tastebuds. My own version of vaper's tongue isn't so much the lack of flavor -- I started keeping 3 diff flavors in rotation to combat that problem -- but just good-tasting juices tasting strange; I had it almost all day yesterday, my very-sweet strawberries and cream, the sweetness tasted artificial to me, though usually sucralose tastes like sugar to me. That coffee/tobacco vape got me thru the day, and more or less fixed the taste issue too.
Andria