There are some good points brought up in this thread an I don't want to distract from someones work.
I personally don't have a problem with someone making an installer for one of my mods that probably does need one with all the mods that have come out since.
As I have said in my Emails Zimmerman I want to see the end result and test the installer myself, but I also mentioned that i need to contact the other members of the team.
However seeing as what your releasing will not contain any actual content from USM I don't see that there would be a problem.
The whole point is to allow people to enjoy the mods without their games being messed up.
If there is something else I'm missing I would appreciate being PM'd personally.