Arduino protected bootloader and code interface

My ***MAX*** budget for this project is $75. Please DO NOT bid if you do not agree with the given amount, nor if you cannot bid for the project within this budget. Thanks! ============================================ Hi! I would like to download a custom bootloader to an (Arduino compatible) ESP32 that will protect it against the downloading of new sketches. This could be implemented, in my opinion, this way: - you modify the standard bootloader to wait for a password string before continuing - you create a Windows App with a GUI (in C# under DotNet Core 3.x, which what i am most familiar with) - the App requests the user for a password (will not be checked) and the path of the sketch to be downloaded - the Esp32 connects to the PC over Usb - the App sends the given password + the hex code to the Esp32 - the bootloader checks the received password: if ok, continues and installs the hex; if not, returns an error code - the App displays the result of the procedure (Ok or Nok with log) - if anyone tries to bypass this App by running the Arduino IDE and downloading directly the hex to the Esp32, the downloader will deny the process because no password was sent before the hex. Can you help me here? Thanks in advance! Paul