Rewrite not applied?

I have a directory /PMHS72/ which contains a few .html and .php files 
that I want to present, and all other files in the directory are blocked.

I need to rewrite requests for the files in the directory to redirect 
any explicit requests for files in the directory, UNLESS they are those 
few whitelisted files, to be sent to one specific one of those 
whitelisted .php files as a parameter.

Here's my configuration -- directory and rewrite rules.

     RewriteEngine On
     LogLevel alert rewrite:trace5

     # Allow direct access to whitelisted PHP and HTML files
     RewriteCond %{REQUEST_URI} 
^/PMHS72/(index|gateway|verify|CodePreview|wrapper|roster)\.php$ [NC,OR]
     RewriteCond %{REQUEST_URI} ^/PMHS72/(privacy|terms)\.html$ [NC]
     RewriteRule ^ - [L]

     # Rewrite everything else under /PMHS72/ to go through wrapper.php
     #RewriteRule ^PMHS72/(.*)$ /PMHS72/wrapper.php?file=$1 [QSA,L]
     RewriteRule ^/?PMHS72/(.*)$ /PMHS72/wrapper.php?file=$1 [QSA,L]



     <DirectoryMatch "^/var/www/html/PMHS72/?$">
         Options +Indexes
         Require all granted
     </DirectoryMatch>

     <Directory "/var/www/html/PMHS72">
         Require all denied

         # Expose all whitelisted files
         <FilesMatch 
"^(index|gateway|verify|CodePreview|wrapper|roster)\.php$">
             Require all granted
         </FilesMatch>

         <FilesMatch "^(privacy|terms)\.html$">
             Require all granted
         </FilesMatch>

         DirectoryIndex index.php

     </Directory>

Any attempt to reach /PMHS72/PMHS-72%20Alumni%20Roster.pdf SHOULD be 
rewritten to to this:

/PMHS72/wrapper.php?file=PMHS-72%20Alumni%20Roster.pdf

Instead I'm getting a server default 403 response, and even though I've 
got rewrite set to trace 5 I'm getting NO error log entries.