Consider the articulation of an affricate - a stop with a slow release, such that the release essentially produces a fricative.
Now, what prevents us from having a nasal airstream during the time of closure? (It will weaken once the closure opens a bit, though, so that bit actually helps us a bit in turning this into a meaningful thing)
/n͡z/ or even /n̥͡s/ could be pretty neat phonemes. These seem realistic enough - at least nz - to actually maybe exist somewhere, so if someone knows whether they're attested, please comment!
These sounds do exist, and they're usually called "prenasalized fricatives". They're most common in Africa, but a quick googling turned up examples from several other regions too: /ⁿz/ in Shona (Bantu) and Central Buang (Papuan), /ⁿʒ/ in Chalcatongo Mixtec (Oto-Manguean), and /ⁿð/ in Meru (Bantu). In most languages that have them, these sounds do not contrast with prenasalized affricates of the same voicing though, and they may be realized as the latter allophonically.
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