I have 2 Corny kegs converted to Sanke amongst my herd of Sanke stainless. I'd love a few more, and here's why - they are just a little narrower than the 1/6 barrel Sankes and I can fit an extra keg in my keezer if 2 of them are Cornies.
With my keg washer, I don't have any concerns about debris in my kegs. I pull the spear, flip it over and place on the keg washer with PBW. Rinse, sanitize, ready for the next batch. I can look inside my kegs through the spear orifice just fine, thank you very much. If they're is any debris, a few seconds with a wooden dowel and a piece of Scotch Brite in my electric drill solves it. But that only ever happens with new-to-me kegs that have been sitting around for a few years with skunge in the bottom.
I've got a friend that is pretty skilled at welding stainless I might try to engage in a little project...