Just added one since you asked nicely :-) Feel free to spread the word and share the link with your friends :-) https://flightsimsquadron.com/2020/10/17/hot-air-balloon/
We're also open to commission work for custom versions if interested :-)
Have a look at this video, try tweaking the config files he points out and see if you can get it to behave anything like what you'd expect how a balloon should behave :-)
I don't know if the flight dynamics of this game supports anything more than a plane but feel free to give it a go. Note you have to restart the game for those changes to be picked up ...