I'm no help on the orthotics, but do have really wide feet. My current shoes are Lake 236 in wide. I love the Boa system. Lake seems to have stopped distributing to the US, I can't find them anywhere in my size, including online UK stores, eBay, etc.
i tried on a pair of Giro Trans at the store recently. They were too narrow, but not by much. They make a "high volume" model for fat feet. Since my Lake's have a few more seasons in them, I didn't have the shop order them yet. FWIW, they are on sale at Competitive Cyclist. Since I took the store's time, I'll buy them there in the future if I do get them. But I'd love to get more Lakes.