Welcome to the community!
The great thing about long-tail keywords is that you don't need a page for every one, in fact you shouldn't. A well-written page can rank for a number of keywords.
What additional pages would make sense, given what people are looking for and what you have for content?
If the queries being used mainly have to do with simple variations, that is something you could probably add to your main widgets page [green widgets vs. red widgets]. If it has to do with a more basic difference [premium heavy-duty widgets vs bargain household widgets] those could probably be separate pages.
And definitely don't worry about matching ungrammatical search terms--Google can figure that part out and the last thing you would want is ugly/bad page copy!