I'm not certain on this, but I think they are generally made with thinner/weaker glass to cut weight/costs.
You could have a low level of water in the tank, but I'd recommend letting it sit for a bit outside/in a big plastic bin to make sure the seals are good.
And you could either straight up replace the screen, or selectively cover part of it with some sort of plastic to control the humidity.
I imagine it would be safe enough to fill almost 1/2 way with water, but I haven't tried it myself, so I can't say with any certainty. maybe put a piece of plastic canvass (what they use for needlepoint) across, and fill 1/2 or part of it with hydroton, and grow plants in there, and maybe have a newt or guppies or something in the other part?