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You can make your own sweetened condensed milk that is lactose free. Using powdered non dairy milk or milk substitute. I posted it above, sorry.
You can make your own sweetened condensed milk. One recipe I found uses powdered non dairy milk. https://www.instructables.com/id/Homemade-Condensed-Milk/
To make your own sweetened condensed milk out of Almond Milk. https://www.instructables.com/id/Condensed-Almond-Milk/