There is a library somewhere I've seen, maybe in a security/pentest/hacking website which allows a program to connect to the tor network without having tor installed. It's the sort of thing botnet control server software probably uses. Perhaps that could be worked into the mix so no need to install tor as well?
Maybe there's something similar for i2p? If so that might be an even better line of enquiry.
The library is Tor. You embed Tor into the client as a library instead of having it running as an external process. This will also open new security issues, since the router software then share the same application memory with the wallet. Also, the I2P router is currently written in Java, and Anoncoin in C++. So it's not possible to do with I2P before the I2P C++ version is finished, but still, back to the security issues then.
But bundling I2P with Anoncoin might be a good idea yes. But then of course as an own application