Ok. I have been giving this some thought while I was in "my office". Do both pots fill with water? Or just one? If they are getting wet, why not just utilize that instead of fighting it with some marginal plants. Some actually so flower of they like their spot. Here's a few pics for you to get an idea:
Piptospatha rideyi 'bicolor' throwing a spathe (flower)


Aglaonema minima (back) and aglaonema simplex (front)


There is also another piptospatha in that pic to the left and a mantella photo bomb, just for the cuteness factor lol



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