Generally, I wouldn't transliterate it into Hebrew at all.
Most often I would use the Hebrew word with the same meaning, AVR, Or.
If I wanted to work with the Latin word, I'd use the Latin Qabbalah Simplex instead. (That's aside from the other useful thing, which is to treat LVX as a valid but irregular Roman numeral, a variant of LXV, 65.) In Latin Qabbalah Simplex, LVX totals to 49, or 7x7, which, among other things, is the same numeration as Latin words for: white, black, temple, "I rejoice," Satan, shadow (or shade), vagina, and will.
Oh, and T.'.O.'.T.'.. Both "Temple" and "Thelema" (i.e., "will") enumerate to the same value as the initials of "Temple of Thelema."
Love is the law, love under will.
Yours in L.V.X.,
Jim Eshelmanwww.jeshelman.com"Success is thy proof: argue not; convert not; talk not overmuch!" - CCXX 3:42