Duplicate WhatsApp Group Members

I have an existing WhatsApp group whose entire membership I need copied into a fresh group. The task is purely about replicating the member list—no chat history or custom settings have to come across—so the solution can stay lean and compliant with WhatsApp limits... (Budget: €8 - €10 EUR, Jobs: API, API Development, Automation, JavaScript, MySQL, PHP, Scripting, Software Architecture)