I see the 185-2 is 50mm which is likely not going to fit into the Palette. My Disting Mk4 *just* fits, when factoring in the add'l width of the ribbon cable and the neighboring modules/cables etc
The Lapsus Os has plenty of utility that would assist w/ pitch. Shades might be a an alternative to consider to free up some HP, or Frap tools 321. You could use the palette's mults to achieve some of the macro cv control of the Lapsus. Mimetic Digitalis and Shades are good companions, you can dial in the wide voltage range that MD spits out by default. Digitakt octaves can be set on the Digi, per note and pattern, so you can choose whatever octave your sound source can handle, as a workaround to getting octave shifts on that CV from within the case.
Side note: Check out Klavis Caltrans, it may have some of the transposition stuff you're interested in, in a compact HP.
uMidi has been reengineered in a smaller HP, not released yet, but it could save you a bit more space to then add a utility or sloth to the 1u row (you might consider another modulation source to feed the FX aid.
Also you might consider a small utility mixer (Shades can do this, too) in case you're interested in using both the VCO and VCF (in self oscillation) as sound sources. Have fun!