Multiple Product in a single link & add custom prcing per inch

1) I want to add a single link as DTF transfer and when the user clicks that he should an option to customize and in the customizer there should be an option to switch product. So, if user clicks DTF transfer he can design any product no need to go to specific product he can swicth from the product customizer. How can we achieve this? pl check screenshot

2) I want the pricing logic based on the printable area so the default printable price will be $5 and if the user increases the size area they should be charged for per inch increament. How do I set it?

Hoodie length 31 L x 26 W x $0.15 per inch + $5 Printing cost

T-Shirt length 31 L x 26 W x $0.15 per inch + $5 Printing cost

Sweat Pants 30 L x 16 W x $0.15 per inch + $5 Printing cost

3) Is there a way we can apply a design template that takes the product images and add customize option instead of designing the views in product designer for each product as we want to apply customizer to all products.