Read the autorun.txt, see this line:
mount --bind /ezxlocal/download/mystuff/unKnown/My_FAVOR/myfont.ttf /usr/language/fonts/AMCSL.TTF
Got it? The mount --bind will change the old dir/files to new dir/files, in this case the old is myfont.ttf and the new is AMCSL.TTF... The new dir exist until you reboot or umount it... Now, run telnet or make a script file and write the above command, but change the old dir (myfont.ttf) to anywhere you want... For example:
mount --bind /mmc/mmca1/times-new-roman.ttf /usr/language/fonts/AMCSL.TTF
You can change the /mmc/mmca1/times-new-roman.ttf to anywhere... After run it, refresh your phone... If something happen, just reboot...