The old NSMB ASM Patching template was compatible with SM64DS, and was the only way to codehax SM64DS, if I'm right. Now that everybody's ditched the ASM Patching Template for the new Code Patching Template mentioned in the thread NSMB C++ Repository; can this new template and NCPatcher be used with SM64DS. Writing codehax for SM64DS like the obligatory King Bob-Omb fix (screw you Nintendo for your shitty coding. Hire some 1337 h4xX0rz ) in C++ would probably be easier than using ARM ASM, even though I don't know either language currently.

NCPatcher can be configured to work with any NDS game (see the repo for more info), however you would be better off asking about 64DS code mods over on Kuribo64.
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Here's my MvL Hacking thread

Consider joining the NSMB DS Hacking Discord Server! Also, be sure to check out the new wiki!

#HakingNoMore

Thank you,  Ndymario. I do have a K64 account, but that place's as dead as a dodo - I've already asked two questions, one of which yesterday; no answer. And as the people here know stuff about the NSMB Code Templates too, I thought, better ask it on here. I wouldn't mind using ASM over C++ though, as I'm a quick learner.

EDIT: Asked the same question on Kuribo64. Prolly won't get an answer though.