Makes perfect sense. Going to try this tomorrow and will leave feedback. Thanks.
If the beer in your 5 gallon keg is already carbonated be prepared for the transfer to take a good amount of time at a very low pushing pressure. Too fast and it will be all foam filling the keg. I have had best results by pushing the beer from one keg at a given psi (say 6-8) into the receiving keg with a regulator connected to the recieving keg pushing gas into that keg at the same pressure. This reduces foaming so a transferred beer doesn't foam up and allows the beer to maintain its carbonation. This is the way to go (if you can) if you don't have a spunding valve.
I have also used this technique to blend many beers from different kegs into one final serving keg (gueuzes, flanders reds/browns, biere de gardes, saisions).