1 product with multiple page templates

[BobbyMacCheese]

Hi, I'd like to add to my regular product, let's say /products/milk , a refreshed look for when people reach the page from a specific page. I know I can create a template "Alternative" and if I give someone URL /products/milk?view=Alternative they will see the product with a different template.

However in all the places, especially collections page, it's impossible to add the ?view= url parameter. What would you recommend? Maybe there's an app for this I can't seem to find?

Also how well does Shopify work with duplicate SKUs? Let's say I have 2 products with different templates but same SKU - will it work?