One possibility to have only one smartphone in your portfolio and still make HWKBD-fans and non-fans happy would be to make a phone without a keyboard but with some sort of docking port that doubles as a hinge. The keyboard could then be sold as a separate unit turning the phone into a "folder" instead of a slider. Since there wouldn't be much intelligence needed in the keyboard unit it could be very thin and since you don't need the overlapping part a slider needs you could use the whole whole space for a decent keyboard (let's say 5 rows).