You should be able to form your flanged patch panel with a domed forming hammer http://www.contenti.com/resources/library/hammers.pdf and a sand bag. If you don't want to invest in a forming bag (leather, shot or sand filled) get one of the tubes of sand made to toss in the back of trucks&cars for winter ballast. Instead of investing in a bead roller for such a small piece, you might consider a pair of flanging pliers Blair BL13229 - Blair Sheet Metal Panel Flanging Pliers - Overview - SummitRacing.com