I'm not an expert, but when I wanted to do the same thing, I couldn't find any plants, except for mangroves, that could tolerate high end brackish, but a lot of common aquarium plants can handle low end brackish, if slowly acclimated.
I started the tank in almost pure freshwater, and slowly worked it up to low end brackish. It's been awhile so I'm not positive what my specific gravity ended up, but I think it was around .004-.006.
I kept an archer, a couple of monos, an eel, and some rope fish, in a half filled tank for a couple years. ( I know rope fish aren't brackish, but I have read about them being found in brackish water at times)
It was planted pretty heavily, and I didn't loose, any plants as I added salt. Plants included, java ferns, anubias, apongetons, crypts, and lucky bamboo. The lucky bamboo extended well above the water line for the crickets to climb on, so the archer could shoot them down.
The tank did quite well for a couple years until I sold it.
Just my experience, hope it helps
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