Although the steaming lifted out the dents the two worst marks also had some cracked/broken fibres, which needed dealing with. You can just see the cracks in the extreme close-up.
I decided to use thin super glue and powdered maple filings to try to reinforce the repair and fill any remaining gaps/cracks. Downside, as expected, was that it made the repair more visible,
Glue dry and sanded back down to 240 grit. It's not too bad and will hopefully fade a bit more as it's sanded down to finer grits prior to finishing and then stained.