Per discussion at http://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_(proposals)&oldid=253867565#P:_and_T:_Pseudospaces there seems to be support for adding two new namespace aliases. "P" should be aliased to the "Portal" namespace, and "T" should be aliased to the "Template" namespace. That is, change the en.wiki entry in our LocalSettings.php to read
// bug#6313, bug#THISBUG
'enwiki' => array( 'P' => 100, 'T' => NS_TEMPLATE, 'WP' => NS_PROJECT, 'WT' => NS_PROJECT_TALK, ),
and run whatever magic voodoo script is used to move the pages that fall under the alias to the Template: or Portal: namespace respectively. All the existing pages are redirects, in the majority of cases there is no corresponding page in the relevant namespace to conflict with. Where conflicts do exist, the system of moving the redirect to a subpage of the new title that was employed for the WP/WT conversion should be effective.