Your solution of combining the tests into a single KeywordTest is the best solution that I can give you. As you noted, though, it does not make the tests explicitly separate in the log that way with each one passing or failing. For that, you will need to add custom code to your test cases or to that "parent" keyword test to distinguish one test case from another. This also means that your reporting may need to be altered to, instead of relying on TestItems to drive the report, use things like log folders (see Log.AppendFolder and Log.PopFolder) to structure your log.
