Most of my game animal 700's have the Sako extractor on them, I even have the jig to cut it but no mill to do it so I take it to a local shop to have it cut, plus I have PT&G bolt for a Model 7 with a Sako extractor. I've known about the weakness of the 700's extractor for a long time, but seriously I've never been around anyone whose handle came off. But that why I originally said it might not be a bad idea.
Since you brought up dangerous game my problem with controlled feed is if you don't make a kill shot, make **** poor follow up shot and need to slap a bullet in under pressure getting it into the magazine so you can get it into the chamber could be the last thing you ever do.
With all that said it's good to have choices, for most guys a full blown custom is out of reach so it's good they have choices to choose from imo.