What is the proper way to expose an Azure Container Instance that is inside a vnet?
If you only want to use the ACI, then there is no way to solve it. What you have found is the only way to access the ACI inside the VNet. But if you do not mind, maybe you can use the AKS, then enable the virtual node, then you also can run the ACI in the VNet and access it outside. Of course, you can use the AKS only, it also helps you run the application in the VNet and access outside.