If you're not a fan of blue cheese, white Cheddar would make an excellent substitute.
Look for crumbled cooked bacon in the meat section of your local grocery store, or cook bacon and crumble it ahead of time so when you are making the pizza, it is all ready to go.
Fresh, thinly sliced pear would be a great substitution for the apple.
Using a dark coated pan creates a crispier pizza crust. If you don't have a dark pan, increase the oven temperature to 425°F.