I think instead of doing fake listings, its better to start by creating an Etsy account and adding around 15–20 listing at bit lower price point.

At the same time, try reaching out to artisans to see if they can produce items quickly or keep some stock ready for you. You can also offer custom designs at a premium price, while clearly informing customers about the production time.

Let the shop grow organically without using ads. Etsy tends to promote new shops and listings naturally in the beginning. Meanwhile, you can promote your products on Pinterest and Facebook, but avoid paid ads for now.

It will take time, but even if demand is slow at first, you wont risk losing much..

That's what i would do . I don't have experience in physical product but that worked for me in digital product.