Custom Phono interconnect build-out shops or vendors?

Try VH Audio. Chris can build you anything you want at reasonable prices. 

Also, a fellow member ,(williewonka)

Triode Wire Labs does plenty of one-off wires of all sorts.

Check the link I gave you in the first answer, Frank at Signal Cable will give you the best value for money, really doubt you can find anything better, custom lengths for all his silver phono cables and connectors of your choice (XLR if needed).

I’ve tried routine internet searches and mostly came up dry. Hence, my phrasing of custom, as in made to order. One Audiogon vendor made such cables to order about 10 years ago. I appreciate everyone’s input. Awesome. TY.