(1), (4), and (5) are fine.
(3) is also fine, though it may appear clumsy to some.
An example of a sentence very similar to (3) can be found in this book
The majority of our six percent of the world's population consumes one-half of the world's nonrenewable resources.
The "our" refers to the US, where the population of the US is six percent of ...
The question asked: "But what about in the case of singular subject performing a verb multiple times?"
Subject and verb agreement is solely based on whether the subject is singular or plural. It doesn't matter if the subject (whether singular or plural) performs the verb multiple times. You would use an adverb or adverbial phrase to communicate ...