I did it without debian chroot. You seriously have to lie your *** off to dpkg. Google ettercap debian armel. Download the deb. dpkg --force-all -i ettercap_blah.deb. Write down it's dependencies. Go download those. Write down their dependencies. Eventually you will have installed about twelve debs with --force-all. I didn't upgrade any osso libs doing this, just downloaded stuff I didn't already have. Then I went into /var/lib/dpkg/status and erased the dependency line from each package I installed, and finally did an apt-get update.
Dpkg is there for somebody else's protection. I have been recklessly breaking it's dependencies on two gens of tablets now and never had it cause any noticable problems.

eh.. reading back over it, maybe that doesn't make any sense.
You have to download each .deb individually from debian's archives.
Then you install each one with dpkg --force-all -i pkgname.deb
After this, open /var/lib/dpkg/status. Search for the sections concerning the packages you installed. Erase the line that starts with Dependencies: from each section. Save the file. Do an apt-get update. Remember it's your own damn fault if something explodes, you broke all the rules.