I’ve published initial version of my plugin PreferenceSync. Guidelines from Based On Sync Guidelines
Upload your preference which is whole User packages folder (Packages/User), and in the new machine download with UUID, your new sublime will become like the old one.
Cool things is it contains preferences (all packages), your installed packages, your theme, color everything. I’ve some more features to do, sortof like publish your preferences publicly and others can use it
Please let me know if you have any issues/ good to have features, etc.