It's probably already been discovered/is only very situationally useful, but I have discovered something that I thought would be worth sharing.
Certain characters have a very small amount of momentum carried over at the end of a dash attack. It's so little momentum, that if you execute the dash attack at the ledge, they won't slide off if you release the analog stick. Instead, they'll go into that animation where they're wobbling on the edge of the stage/platform. If you hold towards the stage, however, certain characters will slide off because the amount of momentum is enough to leave the ledge if they are facing away from the ledge. This will cause those characters to slide off and immediately grab ledge. It's not faster than wavedash backwards obviously, but if they fail to sweet spot, then you can hit them away from ledge, then grab immediately after. It works on all stages with the following characters:
Mario
Luigi
Bowser
Yoshi
Captain Falcon
Ice Climbers
Mewtwo
Charizard
Zero-suit Samus
Certain characters have a very small amount of momentum carried over at the end of a dash attack. It's so little momentum, that if you execute the dash attack at the ledge, they won't slide off if you release the analog stick. Instead, they'll go into that animation where they're wobbling on the edge of the stage/platform. If you hold towards the stage, however, certain characters will slide off because the amount of momentum is enough to leave the ledge if they are facing away from the ledge. This will cause those characters to slide off and immediately grab ledge. It's not faster than wavedash backwards obviously, but if they fail to sweet spot, then you can hit them away from ledge, then grab immediately after. It works on all stages with the following characters:
Mario
Luigi
Bowser
Yoshi
Captain Falcon
Ice Climbers
Mewtwo
Charizard
Zero-suit Samus