Got that warning for the mods, huh :P
I'm doing a little more digging and it sounds like plants that do better in often flooded areas (or for our case, completely submerged), are ones already native to wet areas, and ones with good taproots. Hardy plants are an OBVIOUS choice for beginning these types of experiments.
Ferns may be a good candidate, with a lot of them growing near pond edges, as well as bulletproof things like dandelions and Pothos, plus houseplants that can be grown and propagated in water like Monstera, Chinese Evergreen, Lucky Bamboo, and so on.
Local collected plants and moss by rivers and ponds may have a better chance at acclimating, but with that there's risks of parasites and stuff, so it's risky to do in a stocked tank.