[Elecraft] Is it possible?? Use SP3 spkr for main RX + internal spkr for sub RX??

[andrew vavra]

Does anyone know if the K3S internal speaker can be assigned Sub receiver for dual receive while the Main receiver is piped to an external speaker like the SP3?
I currently have a pair of non-Elecraft external speakers plugged into the rear speaker jack and the rig set for speakers = 2.
I love the look of the SP3, but find the price tag to purchase two of them a bit too high for my limited budget.
de Andy, KD3RF