This is my main anchor, by the way, the one I call plow...(what do you call that in the US?) ...I would NOT use a Danforth as a main. For the record.
That's a real CQR plow, Alex, by the look of it a 20 kg. one.
Your system...I think I'll try it. It's like the use of a kellet in FRONT of the main anchor's flukes...even poorly set itself, the weight and drag will tend to push the flukes of the main anchor in firmly.
The Danforth is good as a "lunch hook" (an anchor for calm conditions when you want to just hang out for a few hours), and it can make a good second anchor for when you are expecting a wind shift (it's set 45 degrees on the lee side), and it can be a very nice stern anchor.
It's useful, but limited in many ways. I know a lot of people on Lake Ontario use it as a main, but it's not suitable to do so beyond casual daysailing activities, in my view.
Of course, I still carry a Yachtsman's, so I'm a little squirrelly on the topic of anchors.