between the door and window you can do 2-2x4 flat though i will tell you that it is much better to have at least 4 1/2" or 3-2x4 flat. you still need a bearing header above the exterior door its considered a bulkhead opening even if its non-bearing. If their is not enough room for the header your engineer and/or architect will need to redo you plans and put in a flush beam in the floor/ceilling.Actually the door and transom window is under a covered entry (second floor) so I have 14" deep IJ over the door and window. The window will butt up directly under the IJ and soffit, and then the door under the 1'-6" window. Im trying to place two 2x4s flat, between the door and window.
so by my calculation you have 98 1/2" for the door then another 4 1/2" between the door and transom then 18" for transom this adds up to 121" or 10' 1" so 10' ceilings frame to 10'-11/8" how tall are your wall/ceiling height? for this to be doable you need at least 11' ceilings or a flush beam.