Pros have seen an Offset tailpiece for Lavatory ?
Most plumbing supply houses have chrome double offsets couplings but they have radius bends rather than mitered.
Keep in mind the ones I am talking about are couplings and not actual tailpieces, so you will have to have do some adapting. I've had to cut tailpieces down in order to use them in most cases as they are about 10" long.
"The physician can bury his mistakes, but the architect can only advise his clients to plant vines." -- Frank Lloyd Wright