The normal way to write it would be to put the 2x out in front of the weapon, though that would look bad as not all items would line up right (and putting 1x in front of others is redundant and wastes space...). If the coverage value within parens is doubled to reflect their combined total, I think that is less likely to be the assumed reading, whereas right now parsing it as either "[name (%)] x2" or "name [(%) * 2]" are both correct.
It's not an incredibly important value, in any case, so not something that new players even need to understand, while later on once they do understand coverage and part lists, the fact that it's easier to parse becomes more useful. I like to err on the side of long-term design benefits when there's no compelling reason for a feature to cater to new players.
By "goal," I guess I'm asking the ultimate purpose of such a change--"provide more clear info" for who? Probably beginners, it would seem, in which case I'd prefer to keep it as is for now.