The correlative ᴹQ. imman or immande “ever, at all, to any degree” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. imma “any” and ᴹQ. -n(de) “degree”.
Neo-Quenya: Since ᴹQ. imma “any” too closely resembles the later prefix Q. im- “same”, for purposes of Neo-Quenya I would update this to ᴺQ. aiandë “ever, at all, to any degree” using the hypothetical prefix ᴺQ. ai(a)- “any”; see that entry for discussion.
The correlatives ᴹQ. imman or immanan “ever, at any time” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/109), a combination of ᴹQ. imma “any” and ᴹQ. -n(an) “time”.