Hmmm... throw in the Gouramis with the Platy duo, and the Lemons would be OK.
My experience with Gouramis over the years has been that they don't play well with others. Dwarf Gouramis are OK in a community setting, but I will never put another 3 Spot of any color morph in a tank with smaller fish.
How about:
- M/F Platy duo
- Gouramis
+ 1 Dwarf Gourami
+ 4 Lemon Tetras