That won't happen easily with a Flora or Lilypad. The 'hijacking' technqiue mentioned in the tutorial bypasses the Arduino's microcontroller and talks directly to the chip that handles USB communication. It doesn't work for boards whose microcontrollers handle USB communication in software, like the Leonardo, Flora, and Lilypad.
To make it work, you'd have to dig into the libraries, find the code that writes data to the SD card, replace it with Serial communication, then connect to your Lilypad with something like Processing, which has a broader range of ways to handle I/O signals.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.