Summary judgment isn’t “an option for an early trial”. It is for when there aren’t any triable issues.
So the report being clearly in favour of C can’t be used to say “trial not needed”. The trial is where the judge considers the report.
An application for the judgment sum to be paid into court because D hasn't been complying could be useful, and could add pressure on D. Whether it’d be heard before the main hearing on the 4th November is another matter, though!
Adding in a request for summary judgment that can be successfully opposed by the one line response of “the issues remain to be determined, the trial is where that should happen, including where the report should be considered” risks losing that application fee, though.