Can a non-Muslim, if guided by God to Islam and admitted to Paradise, marry a Muslim woman who was married in this world, or can he at least see her in Paradise?

A woman in Paradise will be with her husband if he also enters Paradise. If she was married to more than one man in this world, she will be with the last of them. The inhabitants of Paradise will attain everything they desire and more, for "They will have therein whatever they wish, and with Us is more." And Paradise will not be entered except by a Muslim soul; it is forbidden for disbelievers, polytheists, and apostates. Therefore, a servant should hasten to repent and return to Islam.