Transfer all Watchlist to Check-in list

Hello, I'm guessing this will be pretty much hopeless to ask, but I'll try it anyway. I've been using IMDb for way over a decade, and at the start I mistook the Watchlist for the Check-In list and just ran with it until recent times. By now I know the Check-In list is for titles I've already seen, and Watchlist is for titles I want to see. Instead I've been using the Watchlist for the films I've seen, and created a list called "To Watch" for films I plan on watching. I could transfer them myself, I think there's even an option to do that in bulk, but I'm afraid I grew quite particular to the idea the Watchlist shows exactly what day, month and year I added a certain film, it's convenient to look back and see how long ago I had watched it. I'm sure the Check In list would do the same, however, I don't want to lose that information on 1100 titles I've watched. Would it be possible for IMDb staff to copy the list exactly as it is, including dates, to the Check-In List? I wouldn't mind paying for Pro if that was possible!