The law does not explicitly say that the stimulus payments are exempt, but it is believed by some that was an oversight and will be corrected in a subsequent bill. The stimulus payments are NOT to be considered in computing disposable income in chapter 13 cases, for one thing. In a seminar put on by some bankruptcy judges in Houston, Texas they concurred that they would not object to debtors spending the money for living expenses if needed, as that is what the payments were designed for.
Yes. The Chapter 13 Trustees are not looking to intercept this money. Good luck!
Yes, if you meet all the other requirements.