Hi, there're two options to save time with hotspot styles which I think you have explored already:
1. Import from a template project:
2. Duplicate an existing hotspot:
PS: or copy them in xml directly as you suggested. Make sure to close SpotEditor and then copy / paste the hotspots node to your project .xml file in the root of SpotEditor project. As long as your hotspots don't use Image Content, all should be fine as-is. For image content to work, you would also need to copy the hotspot images from images/spots accordingly.