If you don't mind doing it in Debian (chroot, apt-get install dpkg-dev) [because Maemo's dpkg-buildpackage on tablet isn't exactly noteworthy or properly operational last i checked].

Trust me, you're much better off making a debian source package from scratch with dh_make and write a small Makefile for installation into right paths, and then assembling it with dpkg-buildpackage (i know you don't have sources to compile, but installation into a directory is still a build process item).

I did this with 60+ packages from Deblet which was in same form as your constructed deb, and having to maintain it afterwards, release new versions, etc., is just so much easier, and it does a lot of work for you that you had to do by hand before :P