I have done it on my white 1680.
You need another Dial spacer to do it right.
Than it rotates free on a 1680.
but the numbers on the wheel look damm blurry under the huge magnification of the tropic...
I think too blurry,so i decided to change back to my old Datewheel from the Bay...
Lello i have a gen silver datewheel, if you need it for reference,just let me know...
There you can see the printing of the numbers and the finish of the metall...
i think you are the right man to do this,your other wheels look fantastic...