Maybe this would work?
2 Molly
1 platy
6 cherry barbs
2 Bolivian rams
15 espeis rasbora
1 L200 green phantom plec
2 SAE
3 sparkling gourami, or maybe matbled hatchet fish?
1 assassin snail
If that won't work I think I'll stick to my original plan
I'd personally go with the hatchets, rather than the gouramis, less hassle. Also you wouldn't want only a couple of guppies, 5 or more generally keeps the boisterousness (if there is such a word) within the group. My 2 guppies chase the rest of the tank around a lot.