Changes:
tl;dr script that installs and configures PotPlayer to decode MVC (Blu-ray 3D, tested with MKV rips and decrypted .SSIF), optionally with SVP (motion interpolation) and other quality of life tweaks. It can still be used as a regular audio/video player, even including YouTube 2D, 3D and even 360 videos.
Note: configured for NVIDIA 3D Vision (Direct3D 9 exclusive fullscreen though it may also work while windowed) with the EVR Custom Present renderer (required for 3DV) by default.
For SBS output (for 3DTV/VR/etc.) and madVR (which also supports HDMI 3D), just run "Resources\PotPlayer\Settings\Blu-ray 3D decoding.reg" after PotPlayer 3D.bat finishes setting up.