Thx, jppe.
I'm leaning toward very much toward doing a gravel specific bike. The Domane fits a 40mm gravel tire as it sits, but the Dura Ace group set has me on a 50 - 34 crank and 11 - 30 cassette. It's a great setup for the road and climbing is fine (I still do okay with the 34/28 on the Emonda), but steep and soft can be a challenge. A GRX 2x 48 - 31 on the gravel bike with a 11 -34 cassette should fix that.
When I first picked up the current Domane, I thought the extra couple of pounds over the Emonda (and my previous Domane) might be an issue for long climbs, but my time to the top is pretty much unchanged. I'll hold onto the Emonda long enough to make sure that feeling holds.