@Lewn777: This may or may not be relevant to your situation as I’ve not tried the Dura-Ace calipers with SRAM levers. But it still might be somewhat applicable to what you’re trying to do.
I also agree that the current 9100 rim calipers are probably the nicest out there, functionally and aesthetically. They are super stiff, easy to set up and maintain, and look sleek and beefy. They work. Period. For those reasons I tried using them on my Koppenberg along with Campy levers as an experiment. I’ve got Shimano 105 5800 calipers on my rain bike along with Campy levers and it works fine, and gave me the clearance I needed to get full fenders underneath while running 25mm tubular tires. So, with the newer 9100 calipers having essentially the same physical operation as the 105’s (one of those rare cases where a design change hit the lower end group before the higher end), I figured I’d go that route on my Koppenberg, but found that I just couldn’t get them to work very well. Either the brake levers would bottom out against the bars before I could apply full force if ever needed, or they had to be set too close to the rims which decreased the modulation. They just felt “spongy”, through no fault of either the lever or the caliper, but just the whole setup. What it came down to was the difference in rim widths I was using between the two bikes. My rain bike is set up with standard 20mm Nemesis rims, while on the Koppenberg I’m pretty much using 24.2mm width rims. Campy and Shimano have historically had progressive pull rates with their levers/calipers, but on different ends of the spectrum. Meaning when you pull a Campy lever with their own calipers, the pads will move progressively faster, or slower (can never remember which way it goes) towards the rim depending on whether you’re at the beginning of the pull or the latter part of the pull. And Shimano, with their own calipers, would kind of do the same thing but in reverse. So, while the Campy levers seemed to pull the Shimano calipers to the rim just fine for my needs on the narrow rim, it was less than satisfactory on the wider rim. So I ended up going with just the Chorus calipers on the Koppenberg in the end, since they have slightly more clearance than either Super Record or Record.
It’s just something to think about. I’m not sure how SRAM’s levers may work in tandem with the Shimano calipers and it might even depend somewhat on the width of rim you’re using as well, as was the case with mine. You almost just have to experiment. Normally I don’t like mixing and matching, but I agree if the Shimano calipers work with your setup, that’d be a good way to go. I’d just go ahead and try it. If it doesn’t work the 9100 calipers should be an easy sell. But if they do work, then hooray.
Ultimately, here’s how I like the brake levers to operate, as depicted in the far right example of this diagram...