It is safe. Mods that change numbers around do not permanently leave them. The game reads the numbers off a table so if they are changed then the engine changes them to match. So when you remove the mod and load up the game it reads the table and reverts them back to vanilla. The major issues occur if you do not use the mod with the intended update or do not run the LUA with AMUMSS.
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(I also LOVE the multi-tool you used in the image! Is it possible to obtain it or the seed for it? :D)
Or would I have to start over?