If I started a store per customers request would I get any support?

You'll always have competition that's capitalism for you. Start small and stay small until the time is right. Small businesses actually go out of business because as well because they do to much. Yes customers will come but kerp in mind you aren’t the only person in that field. Niches are hard to break into but my advice would be settle on a list of items you can offer first.

Now if you're talking about being a treasure hyhter(not literally) then yea people would use yournservice if it means it saves them time.