The front plate is not the vin tag by which the vehcile is registered, the stamped number is, therefore removing that plate is NOT illegal, provided your intent is to put it back on the bike and not to commit fraud with it by affixing it to another bike. Each state has different laws, but generally I have found that most states regard the stamped vin as the registration vin and the plate a data plate required the federal government to make sure the vehcile meets manufacturing regulations. The automotive equilivaent would be a trim tag ytou find on most american cars.
I thought the plate was affixed by tiny screws, but so long as you get the original style fastners who is going to care?