If I may ask, why are you interested in increasing the size and/or capacity of your oil filter? I've never heard of any MB engine that had a problem attributable to inadequate oil filtration with the stock oil filters. That includes diesels. If your oil is coming out of the drain plug "still clear amber color" as you say after changing at 1.5 - 3 k mile intervals, exactly what is your objective?
This sounds almost as much overkill as the fellow I read about yesterday who replaced his brake rotors every time he replaced his pads, "just because it felt like a good thing to do". Its a free country and to each their own, but it sounds like your car is suffering from OOCD (Owner's Obsessive Compulsive Disorder).
As an alternative to replacing with a different assembly design, and since filtration performance is a function of time in service, why don't you unscrew the old filter and replace it with a brand new clean one every 500 miles?