I doubt you could find anyone willing to spend the time doing it. It's the sort of thing a hobbyist might undertake, or a custom shop doing work on an extremely rare, long out of production vehicle.
It sounds like your best bet is to buy some used flares off one of the users parting out rigs...
I mean, you *can*, but I understand why you wouldn't want to spend the time. That's the neat thing about composites: you can create a mechanical bond to whatever is existing and build whatever shape you want. Then slop on body filler and finalize it. But yeah, it would be time consuming and...
It would be nice if they had a photo of the back side. You can see the holes for fasteners from the front, but does the back side accept the plastic mounting pins, or do they expect you to use double sided tape to mount them? Nothing particularly wrong with the latter, but some may not like...