Hey. A workaround would be what the git package does with: /etc/bash_completion.d/git-prompt which sources: /usr/lib/git-core/git-sh-prompt which in turn provides: __git_ps1() and some others that are thereby unconditionally loaded by every bash instance.
I've asked upstream whether there are means to have files in /usr/ sourced unconditionally, perhaps that would be a better approach - at least if there'd be also a way to mask that again: https://github.com/scop/bash-completion/issues/1055 Cheers, Chris.
