Thanks Mel for posting up the photo of the disk.
By looking at the disk, I can make out 2 holes that are needed for the chronograph 60 minutes elapsed time and seconds hand.
One in the middle of July and Wednesday and another hole just above April.
Seeing that these 2 holes are needed for the chronograph and seconds indicator, that would be the reason why the day will have to remain at 2 alphabets instead of 3 as it will cover up the 2 holes if the day disc were to be made bigger...
A Zenith Elite 3 hands movement paired with an annual calendar would be nicely proportionate for your style but unfortunately, there isn't one....
The Omega Aqua Terra Annual Calendar looks more clean and priced around usd12-24k depending on steel or rose gold but left me wondering who on earth came up with the "coffin shape" day date indicator.
And bear in mind there are no chronograph for the Omegas...