WD40 is made of:
50%: Stoddard solvent (i.e., mineral spirits -- primarily hexane, somewhat similar to kerosene)
25%: Liquified petroleum gas (presumably as a propellant; carbon dioxide is now used instead to reduce WD-40's considerable flammability)
15+%: Mineral oil (light lubricating oil)
10-%: Inert ingredients
Well, whatever it's made of, it did no harm on carbon bars I de-glued with it.
I'd still try Goo Gone first... I think it's the mildest thing for the purpose... That still works well.
To remove the label initially, try some gentle heat from a hair dryer (emphasis on "gentle"). Don't use a heat gun... that would be too hot for carbon fiber materials. Carbon fiber is a plastic, after all. But some gentle warming with a standard hair dryer should help soften the glue and make the labels easier to peel off, and certainly should do no harm as carbon fiber is typically cured during manufacture with some low heat (under 150F, I think).
But some glue will likely still remain... That's where the Goo Gone (or WD40) comes in, to soften and remove the final traces of the glue.
I just looked on a bottle of Goo Gone and it just says "petroleum distillates"... so it's not orange oil. But, it's not very strong stuff, either. Do a sniff test... It's mild.
Yes, in some cases a simple automotive wax might be adequate to get the last of the glue off.
I would NOT use Goof Off (and similar) on carbon fiber/clear coat finishes. This stuff will soften and remove completely dried latex paint, which is pretty durable. Do another sniff test. It's pretty strong. I'd be afraid it might damage the finish.
Whatever you use, simply don't leave it on very long and be sure to follow up with some mild soap (dish soap?) and water to rinse it off promptly. Then dry, polish and wax the finish if you wish.
The logos, paint and artwork on most frames these days are protected under the clear coat (they certainly are on recent Look models, which is what we started out discussing here... with a few exceptions such as the Elle logo), so should not be effected in any way by these lawyer-label removal processes.
I feel confident that neither WD40 nor Goo Gone will cause any problems... But if it makes you feel better why not test it in a hidden place such as under the bottom bracket first? Maybe even remove the cable guide and test underneath that, where any damage from the cleaner would always be completely hidden.