"From what I've noticed during my travels in Germany, I've only seen one person wear a Pickelhaube, and that was a comedian in a resort town on the Ost See. Although Germans have a historical appreciation of their Imperial past, many of them don't discern between this type of helmet and Nazi-ism, in that it's part of their past that they just don't want foreigners using in parody (not to mention that WWI veterans often wore them for Nazi-era parades and such... so there's a physical and historic link there).
It was very good of you to ask, but I'd go with a normal team hat and just save the idea for a costume party with friends... in England.
Finally, I say this as a Pickelhaube collector with close friends in NRW. I wouldn't even THINK of wearing even a toy one at their home."