I wouldn't be inclined to put a wall oven in the entryway between the butler's pantry/kitchen, or right next to the refrigerator. Can you put the oven below the cooktop and the microwave above the cooktop in place of cabinetry or are you doing a vertical vent to the ceiling?

I am doing a vertical vent to the ceiling. The wall oven could potentially go beneath the cooktop - I have deep drawers there right now but I could move those to accommodate.

You have too much distance between your fridge, oven and sink. Move the
fridge on the side where the oven is and you could put microwave/wall
oven where you now have the fridge. I would also suggest putting a tall
cabinet between the fridge and the wall so that your fridge door
doesn't open into the wall. Here is what I am suggesting - assuming 36"
appliances.

I find having the oven(s) near the stove top a must. So often I need to move things from the stove top to the oven for cooking. I wouldn't worry so much about blocking the entry to the Butler's pantry when you have the oven door open. Usually by the time you're checking on what's cooking, you've got your ingredients handier. Also, do you really keep the oven door open that long? I'd go for whatever facilitates your ease of cooking.