I have a 3ds, but I don't have a capture card, and snickerstream doesn't work on ds games. Is Wii U VC viable to run on?

Wii U VC has faster loading times but the VC input lag makes it a very very hard task to perform more difficult stuff like certain Bros Items and Such, other than that there should be no more issues (but that is a BIG one) and afaik no DS timer manipulations. You can always join the Mario&Luigi discord for more specific questions. Some people also records footage from a camera pointing at the console btw