You can't do this without amending the code.
That could be quite a lot of work, and you'll need to think through how you deal with the options that would suddenly allow non-admins to update things currently restricted to administrators...
Who you restrict it to is pretty much unimportant in this answer.
The point Jobin and I are making is that you need to do some coding.
Whether it's to amend the existing ones or provide a new import method with different restrictions, you will need to do some coding.
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