I applied the patches from N93926 Part 1 and N93926 Part 2 to bring my copy of the hildon-application-manager source to 2.1.19.1 (which was the version installed on my N800, but was not the version I could find source for in my development environment).

Once that was done, I used the patch found in BMO 2710 to eliminate the "invalid source" dialog box.

Finally, I built the package in my scratchbox (1.0.17), using similar steps to those used for the control panel. I did need to do "fakeroot apt-get install libapt-pkg-dev" in order to get the package to build, but this should not be relevant for installation, since it is a compile-time dependency only.

I've also attached the resulting deb right here. If there is a better way to distribute this stuff, please let me know.

ETA: According to the author of the patch,

will disable the prompt warning about lack of guarantees of reliability for non-Nokia software. I take no responsibility for people using this package and then inadvertently installing software.