I posted a follow up question in the NaNoWriMo forum, which may get some additional traction: https://forums.nanowrimo.org/t/linking-up-zettelkasten-or-card-index-method-writers/433719

I'm more of a "pantser" (vs planner) when it comes to NaNoWriMo, but if you think about it, zettelkasten provides a solid structure that builds your plan for you as you go.