No, ND Trading is not in business. I called them a couple years ago since they wouldn't answer my emails. The lady that answered said they don't sell any more. I wonder why they still have their website up?
I found these. I don't know if they're any good...
https://www.kuvarsit.co/index.php?main_page=advanced_search_result&search_in_description=1&zenid=hoj95n7brskg38arch993k1440&keyword=egiziano&x=51&y=9
Someone else will need to confirm, but I think all the gen spec Rolex dials have their date windows at the same distance from the dial center. Some of the non-spec dials have their date window closer to the center of the watch. The demand for a date overlay for a non-spec dial probably isn't that great.
I'd like to add to this wish list, even though it has nothing to do with these early subs. Can you make an open 6&9 date wheel overlay? Maybe one withe round 3's and one with flat 3's and have the numbers progress in the direction of an ETA movement? I think there would be a demand for these.
Get a watch hand broaching vise like this
https://www.cousinsuk.com/product/hand-holding-watch
And get some watch hand broaches like this
https://www.cousinsuk.com/product/0045-to-140mm-german?code=B36682
You can check the hole size with this
https://www.cousinsuk.com/product/hand-gauge?code=G0698