I'd say you're overthinking this by several degrees. Ultimately, any pickup will do any application, and we're only ever discussing the last 15% or 10% difference, generally. Bear in mind that for most genres, the amp is what's dictating what's possible and the overall tone, and the pickup is just fine tweaking.
The Warpig is full-bodied and has incredibly rich, thick mids with a sweet top end. Obviously it's been designed to sound like a beast for metal, but those characteristics will translate well into almost any setting unless you're going for the most scooped, thin tone you can manage. I finally got my Warpig installed relatively recently and was expecting a hot, thick mess, but it surprised me. The clarity and richness are so much fun, and the overriding characteristic is it just sounds *huge*.
So through a 5150, yeah, that's going to be absolutely crushing. Through a plexi: massive, rich power chords2, and sure, it's a touch more compressed than a PAF but who's going to notice other than the player? Through a clean amp, again, very full and rich sounding, and yes, it's going to hit the front end a bit harder but that can be accounted for.
So yeah, I don't see why you couldn't use a Warpig for reggae - but then I don't see why you couldn't use any pickup for reggae, as long as you've got a cleanish amp. What you play and how you play it are much more important, and the gear you use can always be made to work around that.
