@Jo the first thought that springs to mind is finding a lapdesk you like the look of and adding one of the more entry-level logitech wireless keyboard/mouse combos like the MK270, 360, or 470, basic but passable
Is there any sort of lower limit for configuration you're looking for though?
@Jo for the record, I'm making this suggestion based on my own setup, which is a K380 and Pebble bought at different times, and they've held up well while still being something I can drop into a drawer when I'm done