The only PRS I've seen with a Wenge neck was the October 2016 PS of the Month. You could probably get one in the PS department on the model of your choice. I made a bass once with a Wenge and bubinga neck and it sounds amazing.
Again I've only used/come across Wenge necks on metal guitars (Mayones's/Ibanez etc) as a combination wood (often paired with Bubinga). I really like it, very punchy and I like the feel - I much prefer more 'natural' finished necks.
I'm sure it'd sound great, but have only played these wood combos in a metal context and not a hollowbody context. But I'm sure your PRS guy will give you good steer with your prospected build!