Personally, I like to keep things simple, so my go-tos, in your husband's shoes (nightshifts with a need for "something" to keep me going) would be either a decent soup - something like brocolli and stilton - with a dollop of sour cream - which is surprisingly sustaining, with the cheese and cream in it.
If finger food is the name of the day, then I'd be on airfried (because we have one!) chicken thighs or leg portions - with the crispy skin on. I'd be going for thighs as they have a bit of fat in them to keep them moist on cooking and plenty of meat, per mouthful. Obviously they can be eaten with cutlery or wrapped in foil, the use the peeled back foil to hold it.
Decent sausages (again in the A/F). Watch the carbs in the supermarket "normal" ranges. They can have quick a bit of rusk in them, which doesn't help us out. Hard boiled eggs. Crispy bacon rashers.
Thick, creamy Greek yoghurt, maybe with some berries in a clip top pot.
There are loads of options. It's just about finding a new routine, but batch cooking certainly helps.
Finally, on bread? I haven't eaten bread in over a decade. It's perfectly possible to live without bread, although I do know that for many it can be the hard thing to ditch or reduce. There are lower carb breads out there of varying qualities, but I'm not your best source of guidance on that.
Good luck with it all.