Ok, I now compiled vim7 for zaurus with standard sharp rom onboard with zgcc. I post the binaries here. Maybe somebody is interested.
To be precise, this is vim 7.0.162. features=normal +multibyte, +ifruby. You probably will need a suitable ncurses (look for libncurses5_5.5-1_arm.ipk) library and (optional) ruby (eg from http://www.focv.com/ipkg/)
These are just the binaries -- potential users will have to get the runtime from someplace else. (The whole package would be more than 4mb).
The binaries were compiled with prefix=/mnt/pkgs/vim70. The binaries thus should go to /mnt/pkgs/vim70/bin (although this isn't important) and the runtime to /mnt/pkgs/vim70/share/vim/vim70/. Use a symlink if you want to put it someplace else. Sorry, no ipkg.
This is the first time I compiled something on the zaurus. I hope it works this way.