Please note that I live in the US, so my carbs are figured differently. What I mean by "carbs" is just short for "grams of carbohydrates. I am half Canadian, so purchase my insulin in Winnipeg... so much less expensive ...and can deal with changing units - generally, multiply the Cdn blood glucose count times 18, and you will get the US amount. Your 6 = my 106 for fasting blood sugar. Oh, and I "carb" totals are both in grams, so no problem there.
It can be really hard to figure what really works. Each person is different. My endocrinologist told me I should totally quit eating "good" bread, such as really tasty whole grain breads. They have way too much sugar! I tried for a while to use home baked Keto bread, which is okay for some sandwiches, but isn't a good substitute imo. The way I generally cope is to look for the bread with lowest amount of carbs per slice, and ignore taking anything off for fiber counts. I have found some bread that has only about 12 carbs per slice, so I can usually get away with a slice with my eggs. Another good substitute is English muffins, which have only about 15 carbs per half, so 30 per total muffin. Just eat half at a sitting. This is lower than many breads because they have so many air bubbles baked in them which makes them less dense. Bagels, on the other hand, may have 60 to 90 carbs per bagel, as they are very dense. A third option is to purchase un-sliced bread, and slice it as thinly as possible. So many sliced breads have really thick slices, thus, more carbs.
As for apples: Try using smaller apples, or try one-half apple in the am, and perhaps the other half later in the day. Or slice it up and eat just one or two slices at a time, then check your blood glucose level to see how your body is dealing with the carbs. I also am a fruit lover, and one of the hardest things for me to give up were apples, bananas, oranges, etc. I loved to follow the "An apple a day keeps the doctor away" formula... I sometimes still have those "forbidden fruits" - hey, there's good nutrition in them, and nobody's perfect, Those are the days I end up taking more insulin, though.
And, dare I say it, if I eat my sandwich filling without the bread, maybe I can sneak in an ice cream bar later for dessert (Ice cream bar = 22 carbs, 2 slices of bread = 30 carbs.) Or, a flourless chocolate cake substituting Swerve Confectioner's sugar for the granulated sugar- works pretty good. only carbs are from the bittersweet chocolate chips, and the whole bag has about 152 carbs, so cut in 12 slices, only about 12 carbs per slice, and wouldn't you rather have that then that stupid slice of bread anyway?
Good luck. I'm sending good vibes your way.