Nice post and nice watch. I've been thinking about one of these too but am swaying towards a blue Pelagos. Talk to Giuliano about him making you a strap, I have a few of this style in 19mm and 20mm on Autavias (it also works on Seiko chronos):
http://www.chronocentric.com/forums/...=read;id=59929
He'll be able to knock up a 21mm version for you no problem, and can do different styles too.
Here are some more big hole straps:
https://omegaforums.net/attachments/img_6196-jpg.36831/
he also does one with small holes which is what would have been on a Rindt Autavia in the 1960s:
https://www.fratellowatches.com/tbt-...carrera-2447s/