I do not think that there is a longstanding allegorical and non-literal interpretation of Leviticus 20:13 that conveys a meaning of "love and treat your neighbor as yourself." I am open to being shown otherwise.
God's sanctuary: the brain.
House of God: brain
Tabernacle of God: brain
These texts are ancient. Thousands of years old. Words and language have evolved.
This whole chapter and most of all of the laws are about an impure and unclean woman(mind)
This chapter of Leviticus is pretty much saying: do not judge, expose another's faults, make them feel guilty, that is taking part in the woman(mind) (lying with the mind) That will lead to spiritual death (separation from God/conscious/being aware)
Every man(soul) has a woman/helpmate(mind). It's either pure/clean or impure/unclean.
The mind, like anything else in nature and the universe has opposites.
The husband: conscious/higher mind.
The wife:subconscious/lower mind.
The wife/woman (mind) needs covered and veiled by the husband(conscious/spirit)
The scriptures are meant for the internalized, not for the physical. It's easy to see the problems, divide, and inequality by taking the scriptures literally. It's also easy to see the problems in the world by viewing things physically and materially. Root of all evil.
Man in the context of Leviticus (soul)
Woman: mind
Sons and daughters are seeds that the mind gives birth to. Not literal kids.
Child: seed of knowledge
Kin: redemption
Childless: without knowledge, wisdom, understanding.
Nakedness: exposing ones faults, placing judgement on another.
Lie/lieth/lie down: be a liar, be in vain, deceive, make bed with(take part with) rest with(take part with)
Uncle: beloved
Uncover: reveal/judge
Fountain of her blood: reasons for guilt/faults.
Their blood shall be upon them: they shall be held accountable, guilt shall be upon them, they shall be judged.
Father: Western Hemisphere of brain.
Mother: Eastern Hemisphere of brain.
Sister: protector that bonds, other half.
Fathers's sister: Eastern Hemisphere of brain. (twin)
Mothers sister: Western Hemisphere of brain. (twin)
Adulterer: whoring after lies. Cheating on truth with lies.
Daughter-in-law: bride.
Husband: conscious
Bride: subconscious
Marriage: divine Union, the two minds becoming one/whole.
Bride(subconscious mind)of Christ(conscious mind/spirit)
Death: separation of mind, back to being unconscious/unaware. Fractured mind.
God is no respector of persons. Every human has a brain and a mind. Entire Old Testament is about the brain and mind.