I have a blackout spinning rod that I don't really use and wanted to use it for trout fishing, I was wondering if there is a way to strip the butt end EVA and replace it with cork? Has any one done this? How would I go about doing this?

It can be done, but is pretty labor intensive.  You can use braid line to saw off the EVA by making a number of cuts, then clean up the blank.  Now use wraps of masking tape (about one every two iches, use judgment to provide a solid base) to provide a few support points for the new cork, varying the wrap to form a "cylinder" of wraps onto which you slide the reamed cork grip.  When gluing, make sure you totally encapsulate all the masking tape to protect it from water degradation.  Slide on the new cork grip.

Your rite it is alot of work for something really  unnecessary, once I started watching videos on how to do it I decided it wasn't worth it.