I can't make videos x.x.
I can only do it to the left. If I attempt to do it to the right, I get the same results as you, AZ; I do like two and they escape. I can't explain actually doing it more than...just doing it, lol. Let me go into training mode or something to try to see exactly how I do it.
I think we can ease into this, though. While the single banana lock is technically demanding in itself, some other things aren't, such as just a short hop to double-dthrow to stutter step Fsmash or Usmash for damage, or dthrow to fair, or anything. Short hop and full hop aerial approaches in general are worth investing time into. Some characters you'd have to do full hop aerial approaches, FF, and dthrow soon afterwards because they have good defensive solutions above them.
I've been trying to use these more, and they've been helping me notably against one matchup, DK (granted I haven't been doing them for a while). He has a large hurtbox, so it's much easier to hit him. This leads to edgeguarding him insanely easy; short or fullhopped dthrows as he tries to get back on the stage from the edge basically nullifies any attempt he can make. If he rolls or does an attack get up, he trips on the banana. If he tries to jump, the banana will hit him and you can fair to push him back off. I've kept a DK on the ledge for about 60% by doing this.
But yeah, there's a ton of potential here, and we need to stop being lazy and actually test out these locks.