I did this for my most recent playthrough, though no subclass ranger instead of ghost heart. I used red-hand with frostseeker for pierce immune enemies and Maia's armor since I rarely keep her in party.
I dumped my con, which felt fine. Between red hand and my pet, I could keep enemies from closing in pretty easily. Most fights the only evocation I ever bothered with was energize. I was definitely playing heavily on the ranger side with chanter just being there to help me hit harder, but picking up some other strong summons and such is probably better. I was pretty impressed with the DPS and I'm sure I could have optimized even better.
