Filed under different strokes for different folks. Getting an OEM Becker was my TOP priority, when we got our SL. The look is so important to me. Just after that, I had to get the correct motorized antenna too. Im an "original as possible" guy.
But back on topic to your application, the "retro" radios do look decent. However if you can't find what you want, another option could be a faceless marine radio (not a traditional single DIN, and is a "brick" with out a normal face). This would install 100% hidden, and works off a wired remote face plate. Unlikely what you want, but is another option.