https://us.ritcheylogic.com/us_en/outback-frameset
So if you are now looking at steel frames with a carbon fork that are 'roadish' geometry like your Windsor- maybe this would work for you.
It clears 40mm tires, has a lower A-C than most gravel frames so it isnt as 'perched', the geometry definitely wont be upright riding, its relatively light overall, and the front end uses a 1 1/8 steerer instead of the large tapered steerers that are common now. The smaller steerer means a stiffer front end than your Windsor, but not as stiff as the 44mm or tapered head tubes on almost all other steel gravel frames. And geometry definitely is more road oriented with 72-23degree head tube angles, about 66mm of trail, and 73-74 degree seat tube angles.