No problem.
It really isn't as problematic as you might think. Training Captains tend to have an aversion to having to do incident reports and pretty much all paper work.
Yes the landings might not be as sweet as if the Captain did them but hey we have bad days as well and there is no one to sort our landings out.
And the only way to get things better is for the trainee to build their experience by doing approaches and landings. There really isn't a short cut to building experience.