Since the Time Savers can not be disabled in the game you need to manually browse the game files and delete the dlc folders.

To access these you can right click the game in your Steam library and select Properties -> Local Files -> Browse.

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Once you are inside the Game Folder you need to delete the folders

dlc_3 (resources)
dlc_4 (collectibles)
dlc_5 (activities)
dlc_6 (technology alias ship upgrade plans)

In case you want to activate the Time Savers again you can backup the folders somewhere else and copy them inside the game folder once you want to activate them.

This method might not work for existing savegames but will definitely work for new ones.