I use an accessible font myself. There are steps to getting the font installed, but you only have to do it once. You basically just download it, convert it, and then upload it to a specific folder. The upload part is the main hassle, because it doesn't attach to the PC like a drive. You have to remove the SD card, open the SD card on the PC or phone and move the font (or book) to the SD card, then put the SD card back into the reader.
It's much easier to connect the X4 to wifi and then upload fonts via the web interface. Apart from the initial hassle of entering your wifi password using the buttons (only has to be done once).
There's a font manager in Crosspoint and Witch, you can download that font directly from the device.