Rebuilding the source packages should be easy enough, just loop over the .dsc urls and run dget -x; sudo mk-build-deps -i; debuild; sudo debi. pbuilder and sbui

Rebuilding the source packages should be easy enough, just loop over the .dsc urls and run dget -x; sudo mk-build-deps -i; debuild; sudo debi. pbuilder and sbuild also work for cross-builds, but I didn't get the hang of cross-building entire package graphs.