The correlative ᴹQ. hrimínen appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. hrim- “many” and the instrumental suffix -nen.
Neo-Quenya: For purposes of Neo-Quenya I would adapt this to ᴺQ. rimínen “by many means” using rim- “many” to be more compatible with Tolkien’s later writings.
The correlative ᴹQ. (li)línen appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. li(n)- “several, many” and the instrumental suffix ᴹQ. -nen.