I guess the easiest/brute force method would be to mount the 32-bit Xorg-7.7-3d somewhere then overwrite all of the 64-bit Xorg-7.7-3d symlinks in the root file system with the 32-bit files.
Once you’ve done that and are sure you have all the 32-bit libraries needed, exit to the console prompt and startx.
Note that I have not tried this myself…