I would rather like to see apt+dpkg ported to FreeBSD libc and userspace, and the whole installation and upgrade of FreeBSD kernel, userland and ports switched to this engine. I think, apt+dpkg is the most essential part of Debian. I also think that porting glibc to FreeBSD kernel turns it into something not being "the real" FreeBSD as we know it. On the contrary, I think that porting your userspace to another libc (FreeBSD libc, uClibc, whatever) is more useful and educative thing. And porting your higher-level infrastructure and scripts to another userspace (FreeBSD userland, busybox, etc.) is even better experience in portability.