Your best bet is to build (or buy) a nice little 16 channel mic splitter. Make sure you use good transformers like Jensen and such. I have a great lead on them. If you're interested send me an email or PM. thumbsup
It's the only real way to do it. Why be stuck with the quality of the mic pres you got on a cheap FOH console? Furthermore, some consoles set the direct outs post EQ. You may not want that EQ setting, especialy if the FOH engineer is EQing for the room and not for the track. stike
A nice 3 way splitter is forever. Female XLR inputs wired directly to Male XLR outputs and the primary side of the transformers. Then the two output windings can go to two sets of Male XLR outputs. If you want to get real, add individual ground lifts for the transformer side outputs and everything will be everything!