At a raw, raw, raw level, you could create your CPAN::Mini-mirror and put your module under "your" directory in the mirror. Then, unshift the mirror with o conf urllist unshift /path/to/cpan-mini and install the tarball as usual with install Highly::Experimental.

I know, it's a lot of work... at least for the first time. In any case, having a CPAN::Mini mirror is very, very handy.