Have you tried to locate another Supplemental counterweight? Try the needle doctor or maybe Vinyl Engine sites. I am under the impression that the 47K ohms is standard for both types of cartridges. I have always thought that the reason the MC carts have lower output through the whole signal path is due to having to push against the same load as the MM carts. Since the MC carts have varying outputs over a larger range it would seem that someone would have a phono amp with a variable load capability.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner
TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv
Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner