"Dusting" - does this mean sending/receiving a tiny amount?
Yes.
And to clarify, @Loyce, are you suggesting I send you (via PM?) a receiving address, and you'll send me a tiny/insignificant amount of BCH?
Correct.
Just to be sure: you'll need to include my BCH-dust in the transaction you're going to send.
Do you mean the transaction from Electron Cash to my Ledger Nano S? Or somewhere else?
It doesn't matter where you send it, as long as there is at least one input that only excists on the chain you're sending, it can't replay on the other chains.
There's the ElectrumSV wallet, and it looks like it has a coin-splitting feature built in. But I guess I was hoping it would be possible to basically repeat the process of importing the seed to claim the fork coins. So, just like I installed Electron Cash, imported the old BTC seed, which made my BCH balance appear, couldn't I now install Electrum SV, import that same seed, and the balance of BSV would appear? But I guess the splitting of BCH and BSV does not work this way.
ElectrumSV worked terrible, it's very different from normal Electrum. And I don't trust them, that's why I prefer to use Coinomi for BSV.