x2 on route
and inlay. It's the only proffesional answer, everything else will look godawful. I use a porter cable laminate trimmer instead of a full sized router pretty often, it'll get much closer to edges and corners, leaving you with less chisel work. It's also just much smaller, lighter and easier to handle in a confined space. In an open space like the OP's you can use a skilsaw with a thin-kerf blade and set the depth
perfect. Then use a fairing batten to get the right curve and provide an edge to run along same as a router. With this sort of thing you can also sometimes epoxy it up and then lam a fresh veneer on top to make it look brand new with minimal effort. Edge-banding usually required. Depends on radius size. If you want to remove it for replacement and it's bonded on too well to remove without damaging something, try removing all fasteners and using a power plane on max depth
of cut just plane it off. I've done whole decks like that, goes surprisingly quick...