Cooker Hood with Off-set flue required
The flue is just a duct, either plastic or metal, so you could create your own offset using standard fittings for the given diameter. If it's a plastic flue you can box it in. If you want an exposed metal flue you could ask someone to weld one.

You can also get flexible concertina-type flues, both metal and plastic. Not as nice to look at nor as efficient as a smooth flue but they might work for you.