Interesting use for Okra as the main ingredient in a dish

More liquid will dilute the okra's thickening tendency. But then your dish will be more liquid than perhaps you want. You could perhaps cook the okra separately and add it right before serving.

Editing to add: your other option is to skip me.

If you're simmering it in a decent amount of liquid for a while, like curry, the slimy stuff (mucilage) will all go out into the curry and end up just thickening it. The okra itself won't be slimy. This is one of the traditional ways to thicken gumbo! Even just stewed okra, with a decent amount of tomatoey goop, usually isn't very slimy.