The only one I still have a question about is Prestadir - those who tell Halros to stay in the Shire seem him read out amongst the list of the fallen after the Battle of Pelennor Fields, but for those that don't (as you mention) don't see anything about his fate mentioned.
My assumption is that Prestadir dies in the Battle of Pelennor Fields regardless - but if so, it would be nice to have his name included in the roll call during the instance with the flaming pyre (not replacing Halros, but in addition to).