If you want that aggressive, organic, plucked/bowed/physical sound, you have three tiers of options:
The following plugins get you 80-90% of the way to Z1 territory: korg z1 vst
If you need exact Z1 sounds: buy a used Korg Z1 hardware unit ($500–800) and sample it. If you want that aggressive
If you just want physical modeling in a VST: get AAS Chromaphone 3 (closest modern spiritual successor). korg z1 vst
If you specifically want Korg's MOSS in software: hunt for the discontinued "Korg Legacy Collection – MOSS VI" on eBay or forums.
Would you like a step-by-step guide on sampling a hardware Z1 into a usable Kontakt or SFZ instrument instead?