Same problem… Per product Shipping combine shipping cost, dont shipping methods.. The essentials would be a way to combine shipping methods for a store can have two distinct products that cannot be sent by the same method. Or any tool that make the shop manager to choose which method of shipping that product should use, at checkout uni-if the values. You couldn’t include this in a future update?
Momentarily could be a function, in which the product is of a certain size and weight, activate shipping 1, if it is a superior measure to enable shipping 2, if both products, adding the value of both shippings. We know logic, where just not apply it hehe!