One suggestion - have you considered doing this using software for RIAA conversion? eg http://www.computeraudiophile.com/f8...o-stage-25328/
Not tried it myself but the idea is quite appealing I think. You'd need a device with good microphone pre-amps to feed the raw phono signal into.
Bit-perfect Streaming: Raspberry Pi 2 & HiFiBerry Digi+ & MoodeAudio; DAC: Beresford Caiman SEG; Power Amp: Naim NAP 100; Speakers: PMC TB2i
Recording: Mics: 2 X DPA 2011C, 2 X Line Audio OM1, 2 X Line Audio CM3, 2 X Calrec CM652D, iSK SM168, 2 X Behringer C4; Recorder: Zoom F8; Zoom H4N; Interfaces/Mixers: Sound Devices USBPre-2, Behringer Xenyx 802, Monitors: KRK Rokit 6