If you are in a tropical area, I would attempt Anubias, or even Cryptocorynes if you can give them shade.
Is Zantendechia also semi-aquatic, marginal plant? Try those.

You have a stream in your greenhouse? I'd love to see a picture! Cool!

honeybunny, I have a topic similar to this one over on the Pond forum with 5 photos

Homalomena wendlandii likes it wet , only small grower and a slow clumper . Some of my pics on IAS site of one in flower . I have to put it in a tray of water to keep them looking good for the few months it does not rain .
Or what about some of the dwarf spp. of Spathiphyllum ?
Lasia spinosa might not be as vigorous in your climate .

It's not an aroid, but for sheer beauty in your zone, I'd go with pickerel weed (Pontederia cordata). Nice foliage similar to the aroids and gorgeous blue/purple blooms. Another is broadleaf arrowhead (Sagittaria latifolia). Similar but larger foliage, but white flowers.

George

Also not an aroid, but you might consider lotus, Nelumbo nucifera.

Bihai, do you have any insectivorous plants in your collection? Some are quite pretty, plenty of varieties out there, and maybe a few of those would thrive, I bet, in/beside the greenhouse stream conditions you are describing. Not that I know what I am talking about (truthfully! ...because I do not have any yet! lol. I'm wanting though very much to purchase one and still looking into which one might be closest to right for my conditions. I really like the idea of having a DUAL function plant; beauty plus bug removal, woooohoo!).

Every time I see one of your photos on a GW thread, I want to ask you to move to my neighborhood! lol. :o) You have such a beautiful collection. Great work by you.