Deactivating a port

Friends - I'm creating some new ports -- stuff from CTAN for TeX, and I am discovering a real need for a pre- or post- deactivate hook (preferably both, but I could live with only post-). What are the chances that this functionality could get in to the base? The reason is that when adding fonts to a TeX tree one needs to run updmap-sys to make the fonts available, but when they go away again we need to run updmap-sys again... I just like to clean up after myself. :-) Peace - John