Since lots of the new characters are coming from Edoras, Lithor can bring some with home on his return journey of Edoras.
Eonwe's,
Dury's, and a few other characters I believe, have talked about King Eomer assigning them to Lord Eodwine, so it would make sense.
I think I'll start a post for Lithor (two days should be enough time to get to Edoras). If it's alright
Nogrod/
Lommy, some of the new characters could converse with Lithor, Balvir, Æđel, and Wilcred when they arrive.