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My gut feeling is yes:
1. Should be using the limited number of terms as uniquely as possible for each page. I would (try to) limit the meta keywords to eight phrases / twelve words.
2. The search engine is most probably going to list a maximum of two pages, so the effort is wasted anyway.
3. The algo could treat this as word stuffing and so veto the whole site?
Your keywords should come from your title, description, headings and first couple of paragraphs on the page.
You can repeat your main theme phrase in there as most of the time it is mentioned throughout the site. The goal is not have any terms in there that are not mentioned on the page somewhere.