Is it possible to limit the set of English locales on a system?

On Debian and Ubuntu is it possible to limit the locales which have to be configured?

I know that /var/lib/locales/supported.d/local and /var/lib/locales/supported.d/en govern which locales are being configured, but short of manually modifying it more or less after the fact (i.e. after an apt-get dist-upgrade) I haven't found any method to limit it to en_US.* locales as desired.

So whenever the packages language-pack-en and language-pack-en-base gets touched (and they usually get updated in lockstep, from what I saw), I get something like this:

Setting up language-pack-en (1:14.04+20150219) ...
Setting up language-pack-en-base (1:14.04+20150219) ...
Generating locales...
  en_AG.UTF-8... done
  en_AU.UTF-8... done
  en_BW.UTF-8... done
  en_CA.UTF-8... done
  en_DK.UTF-8... done
  en_GB.UTF-8... done
  en_HK.UTF-8... done
  en_IE.UTF-8... done
  en_IN.UTF-8... done
  en_NG.UTF-8... done
  en_NZ.UTF-8... done
  en_PH.UTF-8... done
  en_SG.UTF-8... done
  en_US.UTF-8... up-to-date
  en_ZA.UTF-8... done
  en_ZM.UTF-8... done
  en_ZW.UTF-8... done
Generation complete.

Unfortunately some upgrades seem to override those two aforementioned files and thus reset modifications I've made to them.

What'd like to see instead is:

Setting up language-pack-en (1:14.04+20150219) ...
Setting up language-pack-en-base (1:14.04+20150219) ...
Generating locales...
  en_US.UTF-8... up-to-date
Generation complete.

How can I achieve that?