No, you know what, I was thinking exactly the same thing you were for a new technique. I literally woke up out of bed to post it here. I guess you beat me to it, hah ...
Mine is slightly different however. It's riskier. You plant the Claymore and then wait until they have no choice BUT to grab the ledge, and then you jump and edgehog right at the last second. Basically, you trick them. They see you planting the mine, and then go, "Hah. Does this guy think I'm an idiot? Planting such an obvious trap. I can just ledge now- ... Sh*t ..." Truthfully, in many situations, you won't really have the time to plant the mine AND ledgegrab all before your opponent comes back. I kept playing it back over and over in my head, and for certain recoveries like Marth's where your only two choices are to either recover now and land on the stage or recover slightly lower and ledge, I think the timing works out perfectly. Think about how quickly it would go: Marth's hit out, mine, Marth decides to ledge, you edgehog, end stock. Of course, this is all happening within seconds. A tactic like this is all about mindgames, being able to read your opponent, and then reacting in a split second. After a while, if the Marth player is smart enough and catches on, he'll only recover onto the stage even though he'll be damaged by the mine. In fact, this could backfire on you because if you're expecting him to ledge, but he recovers early, he can hit you as you're jumping out to edgehog him. If you're at high damage, or end up bouncing off of the bottom lip of FD or something, you could be in serious trouble (because we all know how upgraded Marth's third jump got. -.-) What I'm saying is that like all of Snake's techniques, you can't get too repetitive with it, because a smart opponent will adapt, and if you're not expecting that, then your tricks will backfire on you.
Anyway, it sounds nice in theory, but it's no good until it's actually tested out. I'll be sure to do that soon.