1) This isn't about the snake. This is about you keeping your word to your wife.
2) If you don't have a quarantine enclosure available then this free snake won't be, because it has to be kept as far away as possible from your other snakes for at least 90 days.
3) Between us my husband and I have ninety-mumble snakes. Before a new one comes in we discuss it and figure out quarantine, what enclosure will be needed for it, whether we can build or buy one (or a new rack), etc.
4) Your wife is pregnant. Don't expect rational thought or actions from her until after the kid is born.