Sorry, i don´t use Mac. I have no plan for any loader (MAC/Win/Linux/etc). No time to do. Please note i needed 3 years to implement a new function to the Firmware.
If someone will do it, i will support with a concept. Any loader should cover all FlashCard variants and Firmware versions.
As the Lynx FlashCard is a development tool the loader should cover some function interesting for coder. Not only loading games.