If you can't write them, get them written. Might as well be the best investment you make in SEO. You would be able to maintain and monopolize your position on the SERPs with 1200 pages of unique content, properly optimized and targeting long tail keywords. Since you mention, these pages are already ranking high and bringing in traffic, IMO you shouldn't try and get rid of them. I know this is not exactly the advise you are looking for but if you are serious about your SERPs then its definitely worth the while.
