Doubt Trump would go with Haley, even if in theory he might need some of her supporters to consolidate the PUB base, but he values loyalty and submission above all else.
Plus quite frankly they have significant differences on various stated foreign policy issues, which are unlikely to be reconciled in a way which appears coherent to American voters come November, where one might expect Biden to be hitting Trump hard on such matters.
Normally, I would agree with you. But there is one thing Trump currently values more than loyalty - staying out of jail and protecting his fortune. And the key for ensuring that is getting elected. And to get elected he needs to broaden the MAGA base.
As for foreign policy differences, I am sure he would do what he pleases, and not listen to Haley, once he is elected.