Although fudging MS with three cardioid mics is not true MS stereo I would not discourage you from giving it a try. I would assume that you were thinking of combining the cardioid mid with two cardioid pointed out of the side. If you have some free time to play with tones I would say try it out.
Note: to further fake the MS technique it might be worth trying to switch the polarity of one of the "side" mics. This might more closely approximate true mid-side. Of course it may end up sounding horrible, so just use those ears.
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