If I was to use or misuse an object that is intended to fulfil a certain purpose for another purpose. For example the purpose of a chair is to sit on. But I can stand on it too. Of course it remains to be chair. According to the answer to this question, the act of using it for another is called exaptation.
I expect there to be a word for any object that is used for another purpose. Any ideas? I'm thinking in the direction of a placeholder.
I feel that the word off-label that has been given as an answer to this question is not suitable to use for that chair while I stand on it.