I just stumbled across the Perl plugin
(an open source installer framework for Windows) from FABPOT
. Super Search did not turn up an announcement of this, eventhough it's been around for some time!
The plugin installed easily and the examples worked "out of the box". A binary is installed along with MSVC project files to build the plugin yourself. So, while the documentation is a little light, you can refer to source.
You said you wanted to be around when I made a mistake; well, this could be it, sweetheart.