I am planning to use T4 ULTRA handlebars as they have a 13mm rise, so the spacers could literally stay the same. That being said I already use 25mm on my VB-R-177, and wouldn't mind using less for aesthetics.
I have a little bit of FOMO, as I am realizing more and more that LTK266-D-SL in size XL would actually be just what I need. Slightly higher stack (= equal or less spacers than on my VB-R-177 = more aesthetic), and shorter reach (= can use current length stem = ease the pressure on my hands and make the bike feel less "long"). Really too bad they are not making the frame in that size, as I don't think I will be going with the size L due to so many variables changing (also how far forward / backward I would be positioned on the bike) that can alter my ride feel compared to my current bike.
Again, I am probably overthinking this a bit, as if I had the frame already I could probably make it work, and even with all the measurements in advance I actually can't predict everything regarding the bike feel.