This is not permissible as it involves riba. If he sells you what he has in his possession by a fixed price that is a lump sum whiteout the possibility to ever increase the agreed price even one dime,  this is permissible.

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This is not permissible for a number of reasons. You can’t marry her without the consent of the Muslim judge in Dubai. You can’t be alone with her as she is non mahram to you. The witnesses must be present and Muslim.

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