That's about as difficult as the multi-cylinder ride that already exists, which has to be done in a 12 month period. 1,2,3,4,6 cylinder bikes.
Japanese, German and US I've done, but after owning a MG, I never had any desire to own another British vehicle again.
Are you going to lump Austrian in with the German bikes? I'm sure the Orange Koolaid riders will object! Finding an Italian bike owner that wouldn't mind me adding a year's worth of their riding to their bike might be a challenge.