It should be possible yes to do something with it, if only for the fact that your kickmic signal is totally not in the side-signal. Question will be how workable the mid signal is, but probably you can EQ out some of the overhead signal there if needed to isolate the kick more. Of course, you'll need to compensate for this loss of mid-signal of the overheads. You could double the mid-channel and EQ one to get the kick out, and the other to get the OH's out. Preferably use linear phase EQ then. Or you could re-add the side-channel-information into the mid-signal (this is a shameless plug for my DrMS
).