Regarding the strategy being discussed and transferring multiple WOW account points to the one QFF account, I wonder the following approach would work?
Say if any one (or more) account had it's redemption settings to "Bank for Christmas" whilst having one account continue to convert to QFF points, then when a sizeable chunk was built up in the other accounts then change the account that has previously been transferring to cash redemptions (and remove QFF #), then go through the other account(s) and change their settings to transfer to QFF adding the Qff #. Once all transferred, reverse back to start position.
Agree it could look a bit sus.
Another approach is create QFF accounts and tranfer by family transfer in the QFF system. Of course that is not without risk either.