I don't use WIN4K3 but you can easily send commands from your ACLog F keys to execute the K3 Memory keys. Here's two examples:
K3 Memory 1 (M1): RI:SWT21;
K3 Memory 2 (M2): RI:SWT31;
Here's a command you can assign to an F Key to put the K3 in Split Mode Up 5: RI:SWT13;SWT13;FT1;UPB7;
Basically you can 'program' about anything you want. You just need the documentation regarding the list of commands.