Hello I'm keen to know if the private key for a legacy address of a bch wallet address would still unlock the bch wallet account?
Look forward to your reply thanks.
Certainly.
I don't know much of BCH, as I just traded all of them back to bitcoin in August 2017, but I think Electrum Cash is able to do that.
Alternatively, you can insert your BTC Legacy Address in a multicurrency wallet, such as coinomi, and insert your bitcoin address there. Then add BCH wallet and it will probably load the balance as well.