Thing is, if I were to insist on running a 2x one side 3x the other I'd rather run 3X on the disc side. You'll exert more force braking than you will trying to accelerate.
I'd be more likely to run radial drive side and 3 or 4X disc side though. cos it's just as worthwhile....
I've run radial non disc side before, but only with normal DT double butted spokes as revolutions stretch too much and the non disc side came loose. Worked fine.
3X both sides with Dt revs or sapim cx rays is the best way to save weight and have wheels that will last a bit.
It really depends upon what you want to use them for. I have an XC bike that I run DT revs with, tried on my 140mm FS but ended up breaking a couple of the spokes as I tended to push the wheels a little too much. so normal DT's on the back for me for that setup. Ran absolutely fine on the front though.