combining inline tube prop valve and adjustable rear prop valve

Ok so I would like to keep the front brakes going through the in-line tube prop valve, and I want to plug the rear brake ports of the inline tube prop valve, then run a separate line from the master to the adjustable prop valve to the rear brakes, would putting plugs into the rear inlet & outlet inline tube prop valve work. not sure I am explaining this right I only want to use the in-line tube prop valve for the front and plug the ports for the rear, and use only the adjustable prop valve for the rear. or do I even need to use the prop valve for the fronts at all since I am going to an adjustable in the rear.
I have single piston factory discs on the front and 10 inch drums in the back and the single chamber vacuum booster. 74 duster with 8 3/4 rear from a 72 duster.