I may have discovered something, though I'd rather discuss it with someone else before starting a new thread.
This may be a way around the tripping animation before the Boost Smash. I was fooling around in Training Mode, going directly from crouch to upsmash. If you tilt the control-stick down -> diagonally down -> up+A you perform an upsmash with the momentum of your walking animation. Of course, the range isn't nearly as much as the boost smash, but it eliminates the likelihood of tripping, as well as opens up a safe(r) way to traverse the stage. You can string the upsmashes with no downtime between. It's also very simple, and doesn't require you to use the C-stick. This is likely possible with more characters, I just haven't been bothered to test it yet.
I don't have recording equipment, but feel free to PM if you do and I'll send you a recording I took.