Using a "Maintenance Page" Rewrite with an SSL Rewrite

I am trying to combine a maintenance page with SSL.

The existing httpd.conf file contains the following SSL rewrite:

RewriteCond %{SERVER_PORT} !^443$
RewriteCond %{REQUEST_URI} !^/index.html$
RewriteRule ^/(.*) https://%{SERVER_NAME}/$1 [R,L]

Which, of course, rewrites all incoming requests to a secure default
page.

I'm trying to add a "maintenance" page using the following directives:

RewriteCond %{DOCUMENT_ROOT}/maintenance.html -f
RewriteCond %{SCRIPT_FILENAME} !maintenance.html
RewriteRule ^.*$ %{DOCUMENT_ROOT}/maintenance.html [L]

The maintenance condition works if the SSL redirect is disabled, but
the combination of the two results in being redirected to the default
page (login.jsp) in a non-secure - http - method. It won't, in other
words, display the maintenance page.

What I want apache to do is rewrite to the maintenance page if it
exists and then stop.

The SSL configuration is enabled by including the configuration file,
but adding the maintenance page rewrite conditions to both *.conf
files does not change the results.

TIA