Parts can be a problem with Specialized.
If you can increase the budget, look at Riese & Mueller. They can make a bike to your spec, but it won't be cheap.
https://www.gazellebikes.com/en-us/g...5D=237%2C9%2C9
https://www.trekbikes.com/us/en_US/b...Code=black_red
https://www.trekbikes.com/us/en_US/b...orCode=reddark
I looked at the reviews and there were complaints about the rear rack being useless. You could still get a large saddlebag, I have one and they work well, I prefer to mount mine with a Bagman. I threw them in because my wife has a Trek Verve and loves it.
https://www.carradice.co.uk/bags/saddlebags