funckey is probably the way to go. You can experiment at the command line:
funckey <some key sequence> replay <grid script>.scr
Press the keys to get the equivalent key sequence, you can use any of the "not reserved" Function Keys with modifiers and regular keys. Once you have the required sequences down, edit the start of the "env", %HOME%\pcbenv\env %HOME% default is c:\SPB_Data to get the keys assigned at startup. Check the assignment settings through Tools>Aliases/Function Keys.