A .deb package can be converted to e.g. package.tgz on your Debian OS.
On DSL you can do this :
ar -x package.deb && mv data.tar.gz package-name.tgz
And then install the *.tgz with : # sh installpkg package-name.tgz
The script 'installpkg' ( = 19 kB ) can be downloaded here
https://docs.google.com/uc?id=0B7S25...ghM4D&hl=en_US