It sounds like a P2P contact or Bisq is your ideal solution… in Bisq you can post a Sell offer in any amount you want and choose Zelle as the method of payment… you can choose a 0% market rate or any rate you want and simply wait for the offer to be accepted by someone… it really is a fantastic DEX, far superior to other options imho… if you want help walking through it I am happy to jump on a call with you and walk you through how to use it and tricks I’ve learned in dealing with common issues