I'd look at an L shape start at the floor of your dining room heading towards your top exterior wall with fridge, dw, sink (under window) and then the range where it is in your first layout. on the opposite wall you could put in a pantry type full height cabinet. i'd also try to clarify what "very expensive to remove" your breakfast nook wall means

One of the various dermestid (carpet) beetles. They generally feed on dried animal matter (leather, skin, wool, etc.) but can feed on some dried foodstuffs.

Second link above corrected: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7436.html (contained encoded characters after the .html) As posted and answered in another forum, these are dermestid beetles (that include carpet beetles). The poster stated she had none of the typical foodstuffs in the kitchen, but few people defend graham or soda crackers, for examples, by putting them in sealable containers. Locating the larval casings (pictured on one of the links above) would provide a better clue to what they are eating.

IMO no way to guess color on a monitor but, my guess is Strong White