Re: Front rack...?
Look for a front rack that came on Schwinn bikes in the 1960's. U.S. made by Wald, they are very sturdy. I adapt them to use as rear racks. These would easily hold the weight you're talking about. These usually came with a spring loaded clamp for holding down school books and that sort of thing. I use a rotary tool to remove the spring clamp if I don't want it there.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...