That's actually really useful, buddy.
Meta Knight will have to plank carefully. If we just shield when Meta Knight can first U-Air at the ledge, we have a few possibilities.
If we shield a U-Air and then successfully glide toss, we safely throw the tire at him, and it should hit him. I imagine it would allow us to get a free aerial; a free Waft, at least. Worst case scenario, we throw our tire off the stage and we're still safe.
If we shield a U-Air and attempt to glide toss at the same time, we shield SDI off, but since we're facing backward, I think we go into that, "Oh no, I'm sliding off" animation, but we should be able to input the glide toss on reaction, rather than guessing perfectly, like shield SDI -> punish would have us do.
If Meta Knight tries to wait it out, his invincibility wears off, and it becomes generally easier to deal with him there.
Obviously, he has options like Mach Tornado, but this should certainly help the ledgeguarding mix-up game if it works like I think it does.
Also, does it work with both a large tire and a small tire?