How tall are you?
You can put the measurements in to one of the online geometry comparison tools and see how it looks versus your existing frames. FWIW I am 182cm tall and have a 54 with a 100mm stem (the reach of this frame is super long). That puts me roughly in the same position as on my Yoeleo R12 RB which has a 110mm stem. I run quite a few spacers compared to my road bike for a bit more control and actually a more comfortable aero position when needed.
I'm 183cm tall. My SL8 setup is 393mm frame reach (Size 56/L) with a 140mm cockpit. Mostly slammed.
Obviously this isn't ideal for a gravel bike. My Yoeleo G21 Gravel bike is a size 56/L with a reach of 387mm, stack 586mm, and I'm running a 120mm stem integrated cockpit. It's comfortable for all-day on country gravel roads. Although the 200km ride I did on my SL8 this past weekend was also comfortable after 6 hours.
I dont suffer any toe overlap with my Yoeleo G21. But I would like a gravel frame with more frame reach, a longer wheelbase, with some extremely tall stack.
Looks like size 540 would make the most sense. With either a 110 or 120 stem cockpit. My plan so is to hop into some gravel races next year so need to run a front end to be able to attach TT bars.
