Are there any food services that can provide appealing, pureed meals for patients who cannot eat solid food?

The short answer is yes there are, but it is expensive. There are a few threads on the forum about puree foods, you might want to use the site search to see what has been said. Here is a recent one:

https://preview.agingcare.com/questions/does-anyone-know-of-pureed-food-for-the-elderly-in-the-supermarkets-i-only-see-pureed-foods-for-babi-440166.htm