I had an idea to do this once, here's what I came up with....
Most lps carry small gerbil balls. They have twist on/off access, and they are vented so the gerbils can breathe. They also float when submerged, so you could have a betta rolling around in the ball in the tank and never ne harmed. You sould use a suction cup to hold it in place if you wanted, and if it came off you wouldn't have to worry about anything. I gave this idea to a lfs, and they use it in their octopus tank so it can't get out.
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