Would it at all be lawful for me to sell my wife according to Jesus's own words in Matthew 19:6? And how will He put to death the enmity?

Probably not. But you might never know, until Judgment Day.

I'd ask for some of what you've been smoking, except I think it would be against my religion.  Matt. 19:6 says nothing about selling one's wife.  It says that what God has joined together, let no man, not even a priest with his marriage vows, divide asunder.  I suggest you read your Bible again, and make it a better one this time -- either the King James or the Inspired Version.  Take notes this time, too.

Genesis 3:15 says nothing about putting to death any enmity.  Satan and Christ are at odds and shall always be so.  He would have power to cause Christ's death, but Christ will have power to crush Satan's power forever.

I'm not going to mine through Hosea 2 to try to guess which verses you're referring to.  If it speaks of reconciliation, it doesn't mean Jesus reconciling with Satan.

Ephesians 2:16 talks about reconciling US with God through Jesus' intervention.

After repeating what God had stated about a man leaving his father and his mother and sticking to his wife, Jesus said: “What God has yoked together, let no man put apart.” Matt. 19:3-6; Gen. 2:24

 This also means that neither a husband nor a wife should put apart what God has yoked together. God views marriage as a lifelong bond. 1 Cor. 7:39

When God instituted marriage between Adam and Eve, he did not make provision for dissolving their marriage.

You need to know how the law works in America.

If you had to pay for all the services a wife does you might go broke hiring others. 

Wives and mothers are cooks, housekeepers, caregivers, taxi drivers, chauffeur who drive the kids around, decorators, party planners, and more than can be listed.   If you feel so little towards your wife see what she values you as. 

I doubt it is lawful according to the laws of your country.