Ken: Yes, you can do that. The PP2 basically is a two-stage design, with the usual Lipshitz style opamp-based MM stage and a linear discrete-transistor-based MC gain stage in front of that - and the selector switch switches between the MM input and the output of the MC gain stage. The pic with the schematic here on AK doesn't really show the switch, though, so I don't know, whether the switch would only switch the signal/+ or also signal ground/-, so having both tables connected might result in a slight increase in load capacity...
Greetings from Munich!
Manfred / lini