Did a little digging, not sure if you’re someone who self hosts (or owns Homekit enabled devices) but Homebridge appears to offer plugins for Xiaomi smart vacuums this will give you more “smart” functionality without the cost of exposing it to the internet.

Shame they don’t offer that flexibility natively.

I’m unfamiliar with Xiaomi “smart” products, I assume there is an app to control the vacuum, if it does have an app does it still work for you strictly behind your LAN network?