Since you seem to have limited options, I'll offer a few others.

How about archiving the files with something that preserves the file attributes ? zip format perhaps ? Of course, you would have to have a scheduled job running on the webservers to unravel the zip file when it appears.

Another idea would be to use either smbclient ( from the samba distribution ) or smbfs (if you happen to be using linux on the "push" side) to distribute the files to the web servers via CIFS.