I'm curious what's off to the right in your first picture. Is there another fixture or something that might me more amenable to the DW drain?
You might find a suitable drain saddle tap that could be fitted in a more convenient location on a standard tailpiece. The ones I've seen are for R-O filters and have 1/4 connections though. You'd need 1/2 or 3/4.
If you're really desparate, I think it would be possible to fabricate DW nipple tailpiece from a plain brass one, a brass nut and brass barb cut and soldered together.