I know I’ve seen posters and other things larger than a standard card get graded, is there a company that will grade six cards in a collage set and then grade the set on top of it all and do a combination slab? Would that even make sense or would having each card graded and kept as a set still make it more valuable?

Context, these cards are a Lord of the wrong Magic the Gathering foil set worth ~$80 raw according to Collectr as combined individual prices.