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The cleanest way to do this for an M-3 is probably to rewire the AO-29 preamp/amp. Get ahold of the schematics for both the EM and PM versions of the AO-29, and make the appropriate changes in the power supply section.
?EricSimball has written up detailed notes on what's involved. See AO-29 EM To PM Conversion.
You can just replace the field coil winding with an appropriate power resistor. This is Hammond recommended method. (In some of the older organs, like models M, S and S-1, Hammond recommends changing or adding a power supply filter capacitor as well if this method is used.)
See TSB 27 for details on this method.
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