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You can update the firmware, install watchfaces and have nearly 100% functionality.
Edit: apparently there is an app called EasyFace, but it doesn't seem to be open source, and it says it needs to be run with admin privileges. TL;DR: nah, man, I'm good.
They're absurdly cheap for a device with specs like these. I picked one up off Amazon, along with a small selection of aftermarket metal and nylon-weave bands. It's been years since I bothered wearing any kind of bracelet, and the fetish for expensive watches as conspicuous display of debt-financed pretense of wealth passed me by, but a bracelet topped with a cute little OLED touchscreen, bristling with sensors, and powered by what appears to be an extremely open and friendly programming environment? That's worth the trouble of reaccustoming myself to a somewhat unfashionable accessory.
(Make sure there isn't a space in the simulator executable's pathname. Also note that, because the Band 7 runs Zepp OS 1.0, you won't be able to use any feature that's documented as requiring an API_LEVEL, i.e. OS 2.0 or higher. That's probably part of why these are so cheap, but if they're as flexible as I get the sense from these docs they may be, I'll be upgrading pretty soon to something much more capable like a T-Rex 3.)