Well, as a person who is actively trying to solve a similar problem - i want to go with the flat top 3's on my 1680 but am reluctant to attempt to get the Watchmeister overlay in the 1680. (I have it in my 1665 - and it looks great). I am not sure that I will like it under the date magnification.
However, i have other overlays that I have been attempting and they have not been positioned correctly in the window (with all numbers being to left justified). So, at this point - I am willing to go with any metal overlay solution which will place the date into the center of the date window. I can't stand mis-aligned dates. Yes, i have seen these messed up in genuine watches (none rolex) but it still bothers me.
So - in your DRSD - i would go with the Watchmeister overlay. It will look great if you can get in aligned the way you like it.