The stuff I primarily use for spiking is Paul Mitchell styling glue. The ICE product line is similar, but I've found the the P.M. formula works a little better with wigs. After you get it spiked the way you want, just load on the hairspray.
As for the wig, if you added a long section to the back, I could see that as working. It might be a little on the short side on top, but that depends a lot on the size of your face. ^_^
"Katie Bair's Art Emporium and Petting Zoo" - Custom Cosplay Wig Designs!