We had a couple places in Milwaukee I talked to years ago that did chrome and hard chrome, none of them had the plasma deposition process needed for plating to aluminum.
Millennium technology in Plymouth, WI is the only place that would hone a moped size cylinder, they only wanted 175 back in 2012 but people are telling me they are closer to 300 now.
Hopefully Jurrian will post what he finds with European suppliers. We are a ways off from that just yet