I really miss bread. Before I had to get serious about cutting it all the way out, I found the Franz "white" whole wheat bread had the best size slice/carbs for a sandwich. There are the sandwich thins too, they were all the craze for quite awhile but harder to find now. Costco carries them, as does the Franz outlet stores. Tortillas can have less, but my portion size is just one 6" whether flour or corn.
We do lettuce wraps for sandwiches, one of our favorite going out treats is a Jimmy John's Unwich, everything from their subs but rolled up nicely in lettuce. Other chains also offer lettuce wraps but Jimmy Johns does it the best. There were no options at Subway that were better for me carb countwise.
Hubby is pure keto, I'm just low carb. One of the other things we do is make a sandwich between two slices of cheese and no bread. You can spread toppings on the cheese but best with just meats and limited veggie.
There are super low carb breads that you can order. Great Low Carb Bread Company is one, I believe it is available through Amazon even. We can go to Tacoma Boys and buy it frozen there on our way to my relatives. It is pretty darn good stuff, but too expensive for every day and I'm just sort of uncomfortable with the concept of eating some of the non-digestible fibers.
There are many things that you can serve food on, like eggplant slices or it's great for those huge over-grown zucchini, or mushroom caps. You can even cut cauliflower "steaks". Cauliflower is very versatile, can mash like potatoes or used instead of rice. But the reality is they are all knife and fork sort of things and not the easy bliss of a sandwich with real bread...