Apache: mod_rewrite if 404 redirect to archive and back (if 404 - no loop!)

archiv.example.com.apacheconf

# Redirects for 404 to www.example.com
# adds "?redirected" to url that www.example.com doesn't redirect back
# (basic idea form http://stackoverflow.com/a/11078887/286611)
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) http://www.example.com/$1?redirected [R=301,L,QSA]

# Location of the error document
ErrorDocument 404 /404.html

www.example.com.apacheconf

# Redirects for 404 to archiv.example.com
# only if query "?redirected" is not in url
# (basic idea form http://stackoverflow.com/a/11078887/286611)
RewriteEngine On
RewriteCond %{QUERY_STRING} !redirected
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) http://archiv.example.com/$1 [R=301,L,QSA]

# Location of the error document
ErrorDocument 404 /404.html