To assemble the éclairs: Slice each strip of bacon down the middle lengthwise so you have eight long strips. Wrap strips around asparagus spears in a spiral pattern and place on a baking sheet lined with parchment paper, leaving at least an inch between them.
Place pan on an oven rack positioned in the top third of the oven. Turn on oven to 400 degrees. (Bacon will hold its shape better if it starts cooking from a cold oven.) Bake for 10 minutes, then turn them and continue baking 10 to 15 minutes or until the bacon is crisp.
Turn off oven and move asparagus to a lower rack.
Cut a thin slice along the top of each éclair to reveal the interior. Spread 1 tablespoon of the flavored cheese inside each éclair, then arrange them on a baking sheet and place in the still-warm oven.
In a nonstick frying pan, melt 1 tablespoon butter over medium heat. In a bowl, whisk the 8 eggs (and extra yolk, if using), then pour into the pan. Turn the heat to low and, with a wooden or heatproof spatula, begin stirring the eggs, keeping them in motion as cooked curds begin to form. Keep stirring until egg mixture looks fluffy and just shy of fully cooked. Remove pan from heat. (Eggs will continue cooking. Do not overcook.)
Place éclairs on individual plates or on a serving platter. Divide scrambled eggs among them, then top with an asparagus spear. Serve immediately.