Halfling is the heritage. Kender is one of the many cultures a halfling might choose. I’ve taken the approach of Kender not being a heritage.I like it mechanically but doesn’t it run into the trope of monoculture? Does the Kender culture have an analogous Human culture? Maybe I’m over thinking it; I’m pretty drunk with the in-laws going quietly insane.
Maybe call it Communal Culture or something like Kibbutzim?
Edit: now that I think about it Kibbutzim seems like a slam dunk for where a Kender might typically hail from.