The adverb uo “together” appeared as a derivative of ✶ówō in a rejected page of notes on the etymology about the prefix o- of the same meaning, probably from around 1959 (PE17/191).
Neo-Quenya: Though the page is rejected, the etymology of ᴺQ. uo “together” remains plausible, so I would retain this adverb for purposes of Neo-Quenya.
[uo adv. "together" (PE17:191)]