The solution is simple, dont use the font hack, use the audio hack. It should be easy enough to install if you have the font hack ftp already up and running.
Ive done this on 2 xboxs (1.0 and 1.1) useing slayers backup iso (to get the boxes to dash 4920) and modens 007 installer.
heres what i did:
Opened FTP, overwrote all the files on my C: with the ones from slayers
Installed the audio installer to e:/UDATA
ran the installer from within 007:AUF (make SURE to go into a game then come back out or it WONT WORK, it will seem like it but it wont)
booted into mxm
ran dvd2xbox and poped in a game disc and it worked like a charm.
before that game discs would just read as 11mb dvd video discs. There must be a problem with the new font hacks (i never had that problem before i used reloaded)
so there ya have it, hope it works for you!