I’m not sure what you mean. You only need to do this once in your first scene, then the loaded global variables are available in every scene and every external sheet.
As option 4 there is also the possibility to save it as JSON, then all childs of a global structure variable are filled with one action.
For the beginning, with only 10 variables, I would live with the 10 extra actions to convert scene to globe.
If it were up to me, absolutely yes. I’ve wish this since the firebase feature came out and have it on my current list. #17 https://forum.gdevelop.io/t/open-for-discussion-a-few-improvement-ideas-for-open-source-contributors/58938
Maybe it’s more complicated than we think and the developer will say, you shouldn’t load 10+ fields manually.