The Revenge of Doctor X
This is a 1967 low budget sci fi movie about a NASA director who vacations in Japan. While there he develops a man eating plant. Apparently it has many alternate titles, including "Venus Flytrap" and "Body of the Prey". The actor playing the mad doctor bizarrely overacts to the strange, mismatched soundtrack while his lovely Japanese assistant supports him for some reason. This seems to be right in the Rifftrax wheel house.
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Tom Porter
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Mario commented
They have done it already!
https://www.rifftrax.com/the-revenge-of-doctor-x