Though I haven't finished checking, (Edge's ctrl+f is... inconsistent) syllables that don't seem to be at the end of any word in the 2015/9/23 Language Guide are {be}, {ro}, {šai}, {koi} (it ends only Callie's name, {Pekói}) and {se} (it's always {ise}, isn't it?).
My proposal is as follows...