why not get two middle aged i.e. 8-10 year olds - rescue centres are full of them
they would be happy as home alones, won't wreck the place, won't go missing like kittens left home alone and will be just so happy for whatever time you can give them.
they will give you no hassle, no peeing everywhere, shredding carpets, just sleep most of the day and cuddle up on a lap at night.
i wouldn't get a pedigree or an oriental, they are too needy and demanding ( i have a mad burmese blue) but british short hairs are quiet, easy going, happy cats. some of the orientals really are high maintenance.
we have a couple of middle aged persians and they are very house cats, veyr easy, just need a lot of grooming - but they entertain themselves and are very laid back