I'm sure you'll find loads of things to purée.
On one of the wards I used to work on there were no special meals prepared. We simply had to tip the meal that everyone else was getting into a blender and whizz it up . Ack! Ack! Ack!
Was just one of the reasons I jacked nursing in.
Couple of sites that may be of use/interest...
Nestlé Nutrition (you may not agree with Nestlé but good for ideas)
another one with suggestions for diet
Last but certainly not least...this is a great company that supplies meals already puréed.
About £36 for 12 meals. You can order a mixed pack. They do puddings too. Saves you all the hassle of planning, cooking, puréeing and delivering to him etc etc and you know it's nutritionally balanced. Looks ideal for occasional or back up.
Got to dash...