I recently got a device for slow panning my camera. In no way sponsored or an endorsement but I ended up getting the Star Adventure Mini (SAM) from Sky Watchers for just over £250. One of the sites I was looking at said it was a good entry level device and it should be ok with the weight of my heaviest camera and lens.
For these shots I used the app to manually rotate the camera and it seems to do about 180 degrees in about 12minutes or so. It’s fairly easy to set up if you have a modular tripod. Unscrew the head and pop the motor between the head and tripod and you are good to go.
The plan ultimately is to try and get some nice very slow pans from the top of the hills around town.