How about this: Really big planted set up and angelfish with cardinals. Then you might even be able to throw in a pair of rams. With that the stock would look like 3 angels, 1 GBR pair and maybe 20 cardinals. Not sure how well that would work but I can see it happening. I'd personally still go with the half land/half water tank, but you can do whatever you want. Definitely want to see how this turns out. I wish I had the problem where I had tanks lying around to play with!
My tanks (so far
5.5 gallon Planted Dwarf Puffer tank (2 Dwarf Puffers and a lot of RCS!)
16 Gallon Planted
(GBR pair, 3 amano shrimp and a whole bunch of snails!)