Spent a few hours looking into this. Its not simple. I'm concerned that such modifications may exceed my abilities. It looks like its best to just start over again with a litecoin wallet and built it back up for NDL.
You're on the right track.
Though if you're planning to rebase, going to v0.10.4 is definitely not aiming high.
You'll want at least v0.13.0 where the internal miner is removed so that anti-virus software doesn't flag the wallet and delete it on people.