Solutions for converting vinyl to 256 DSD?

@OP. The choice in DSD ADCs is pretty limited. The Tascam DA-3000 could fit the bill. But you would need to A/B it against something like one of the two channel RME ADI Pro interfaces. If you are doing the conversion yourself, you might be surprised at the quality of a 24/96 recording. In terms of recording - as opposed to reproduction - the quality of the converters is more important than the encoding system

I hope I've understood your predicament... when I "digitize" my records I go from turntable to "USB PhonoPlus" by ART, then into pc via USB cable. Music is captured by Adobe Audition - but you can get Audacity for free to do virtually the same thing. I've been very pleased with the quality of the recordings.

Hope this helps.

   I've had a similar concern, such as, "what to do with 160 Duke Ellington lp's"?  I suspect that you are underestimating the personal cost to digitize a significant # of lp's.  Factor in, e.g., a top a\d converter, wear on expensive stylus, cleaning lp's, and especially Your Time - life is too short.   

     If you don't want to pay attention to advice from the likes of @mikelavigne and @ghdprentice - why even ask?

@OP PS - Update on my earlier post. The RME ADI-2-Pro FSm specifically, will record both PCM and DSD, so you can compare both encoding schemes.

@ghdprentice 

Thank you for the Saint-Saens reference ... glorious.