My recommendation would be to add an RIAA board inside such as https://www.ebay.com/itm/185373986428?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=i_P7_Iv4Tsu&sssrc=2349624&ssuid=WrB3U2kWQBO&var=&widget_ver=artemis&media=COPY. This is just an example of one that can run off of the +12v single supply. I’m sure there are higher quality ones if you scout around. You can find the user and service manuals on Beocentral.com.
