I would have it, but I'd alter the way you eat it, especially not knowing. Put half the fillings onto a bed of lettuce and enjoy them. Double stuff? Doesn't that mean enough fillings for two people in one bun? That can be a meal in itself, all the veggies and cold cuts turns a bed of lettuce into a chef's salad. If you're craving starch, and you know the effects the type of bread has on you, cut the rise in half and eat just the top half of the bun. With the oil and flavour it probably absorbed from the fillings, it's good as a side.
Improvise
I usually use the half rule for high-carb foods, desserts, etc. Less guilt, smaller portion, easier burnoff, faster BG decrease.
Improvise