If it is a Romanian award, the ribbon that would most closely match would be the;
Order of the Romanian Crown -Type 2. A WWII award.
The Knight's Cross came with crown and crossed swords. However, if the original ribbon bar maker didn’t have a Romanian Order of the Crown ribbon and he used Württemberg LS ribbon, he would have likely put a crown and crossed swords device to indicate the Order. (Another one like the one he used for the BMVKwS would have done nicely.)
Furthermore, if a foreign award, even if a gallantry award, I would have imagined that he would put it after the Fatherland’s Ost-Medal.
My conclusion is that the ribbon in fifth place, right or wrong, is meant to represent the Württemberg LS medal.
Christer: From that short list of BMVKIII with Swords Landwehr recipients….can you see if they received any other (Württemberg) awards?