[v1.6.1.10] Show custom icon if merged couriers

[Nandos]

Hi guys, here is my thought about this little graphic implementation.

Let's say a customer orders 2 products, one from a warehouse and one from a another warehouse. Let's say each warehouse has its own courier, so PS merges those 2 into the order, showing this merge in the shipping details (f.e.: UPS+TNT). In that case, i saw PS doesn't show an image of the 2 couriers, so here is the idea:

How can I show the images of those 2 merged couriers? Or, alternatively, how can i set a custom image only if the merge occurs? That would be a comfy graphic solution for the customer.

Any help?