I don't see how any of this is "just looking," because I think you're vastly underestimating the scope of what you're claiming to undergo here. And like I just said, having any of said commercial code in a public repo is very likely going to have some unflattering private emails sent your way (not that a simple disassembly of the binary is going to do you very well in the first place, but I digress).
We are not saying this to put you down or anything; we're saying this so you're properly informed that what you've not only requested, but also claiming, are simply impossible and not worth the effort of undergoing. If anyone's going to make a DS emulator (for whatever reason, even though I firmly believe the 444mhz CPU in the Vita is going to be a major bottleneck in this context...), it has to be done from complete scratch.
This means extensive knowledge of the Nintendo DS's insides; the CPU, the RAM/ROM, how everything interacts with each other, the little idiosyncrasies in each function and how each game specifically utilizes them, etc...
This means having knowledge of a programming language that's not only powerful enough, but also tailor-made for the Vita and HENkaku homebrew standards to start a project from.
This means throwing out any and all outside sources of code, as they will be incompatible with your new project, and will require a from-the-ground-up effort.
And not only that, this means having the foresight to see that DS emulation on the Vita isn't very feasible, no matter HOW you spin the situation.