Unfortunately that would require an additional user input to be added to the application for legacy prestige, which would take a while to get approved here so it's not worth uploading just a simple change like that.
However, with any text editor you can replace all instances of legacyPrestigeLevel in Bloodweb.json and GetAll.json with your desired prestige, like in Visual Studio Code (CTRL+H to replace):
Put first box as:and second box as:Code:"legacyPrestigeLevel": 3and then replace all instances.Code:"legacyPrestigeLevel": 0