I contacted Miniatures Minichamps to ask about the availability of an Alpine White M2 model and received this reply: "For now only in Black, Blue and Grey. Maybe a white version later but not confirmed for now."
So, if you're looking for a white model, it probably wouldn't hurt to send your request through the company's contact page at:
https://www.miniatures-minichamps.com/gb/nous-contacter.