Also, "right-to-work" would violate Section 19 of the Kentucky Constitution, which forbids "impairing the obligation of contracts." But I don't expect the GOP to care about what the Kentucky Constitution says.
Your skills at interpreting constitutional clauses need work. That's the same language found in Article I Section 10 of the US Constitution and it doesn't hamper right-to-work laws in other states. At the most, that language means that passing a right-to-work law wouldn't affect any current contract, but it came time to renew or renegotiate that contract, the new agreement couldn't require a union shop.