No, that won't work, you only get to see the cutscene once, after you die, you just enter the boss fight with Sif already aggro'd and ready to fight. No cutscene whatsoever. This is how most of the boss fights work. If you want, just watch the original on youtube, then check out the DLC alternate in your game. Or, if you plan on playing this game a lot more, just do it on another playthrough.