Sure you can... They can be programmed to operate just like fixed 1 &2
Menu/System/ DCS set up/ Select the var channel and hit FXD. The channel is now in fixed mode and will remember the setting until you change it back. (same commands however the fxd is like a toggle switch. It changes the channel from fixed to var to fixed with each press. The remote will tell you what mode you've selected. There is a slight delay powering up the var channel when set to fixed, A second or so and everything comes to life. You do need full power on the input side of the var channel whether in var or fixed mode. Where you get it is up to you .. jumper from Fixed 1 to the var channel IN might be a option.
