If you open the pressure release valve and lock it open it the carbonation will come down although this takes a while. You can transfer it carbonated. The trick is keeping the new keg cold, the lines cold and having some back pressure at the receiving keg so all the CO2 dosen't come out of solution. You will still have some foaming but it really shouldn't be that bad. I have done it with commerical beers that I have transferred from Sanke kegs to corny kegs.
If it is the orange peel that is affecting this I would suggest pulling the dip tube out and putting a nylon hop sack or paint strainer on the end of it. This will act as a coarse filter and keep the dip tube open while you transfer.