[wagnerian]

It is not so difficult to change the default font for the mobipocket viewer.
Copy the /home/intent/rofs_target.bin file from your iLiad to your desktop.
And rename it into rofs_target.zip and unzip it.

Now, the fonts are specified in the /ave/font/store.map file.
Open the store.map file with your text editor and modify it, rezip the files into rofs_target.zip and rename it into rofs_target.bin.
This modified rofs_target.bin is what you need.