Tried basic HB methods of troubleshooting, fresh install, ran the buddy wizard, re-installed my pre-reqs for running HB, made triply-sure WoW was x86, Disabled all buddy store streamed purchases. HB still opens, immediately shuts, and is not visible as a process afterwards.
Oh wow...I didn't even think to check the DX settings in the game...I generally run on 9 for compatibility with HB and morph, but sure enough it was on DX11 and HB started up perfectly fine when I swapped it. Thanks so much