I think it is a disaster waiting to happen. But if it were me & I was set on doing this without the correct bottom panel or just to test it for the hell of it, I would use silicone & put that "patch" on top & then place something on the outer bottom on the tank. Maybe a cut piece of wood so the pressure doesn't push through the lower crack.
I am not responsible for what you decide to do in case of a disaster, this is just an idea...
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