Thanks so much! That spread sheet is AMAZING. I do have 35 mm of spacers on the BMC. And I think the overall total stack on the Diverge is actually about 40 cm lower than I stated if you correctly measure from the bottom of the stem.
With each of the comparison bikes on a 10 cm stem it would seem that there is only a small difference in overall reach between the bikes with the Waheela being 3 mm shorter than the BMC, the medium Lauf 12 mm shorter, and the large Lauf 5.5 mm longer. The difference the program gives for the Diverge is 8.5 mm shorter. I will play around with the spread sheet a little more, but I think any of the bikes would be acceptable size wise. I will also check the geometry triangle.
However, there is always that unknown about actually sitting on the frame and going for a 10-15 mile ride.