Reddit mentions of Tofu Broth Seasoning (Kimchi Mushroom)

I know you mentioned he already has plenty of porridge, but what about some flavor combinations that he might not have had? https://siroousa.com/menu-kfood/ Under Siroo Juk, there are a variety of flavors for rice porridges. The curried one and abalone are some of my favorites.

I also really enjoy steamed kabocha squash that has been blended into a kind of pumpkin porridge.

I really like custards/pudding type things. http://notwithoutsalt.com/st-john-bakery-doughnuts/ This is one of my favorite vanilla bean custards, and could definitely be enjoyed on it's own. https://pinchofyum.com/blender-lemon-pie The filling for this pie is also very simple and could probably be made without pie crust in ramekins.

As for soups, what about soups from various cuisines? Korean silken tofu stew is pretty soft and you could easily adjust the stew by straining the vegetables and meat. There are pre-made seasoning packs of the stew (https://www.amazon.com/Jayone-Foods-Broth-Seasoning-Seafood/dp/B00AWSR4T0?th=1), that you could dress with even just some onion and zucchini that has been chopped very fine without meat, starting with swanson's chicken broth as a base to make up for not putting meat in. https://seonkyounglongest.com/silken-tofu-soup-soondubu-jjigae/

https://www.koreanbapsang.com/gyeranjjim-korean-steamed-eggs/ Steamed eggs comes out quite soft as well.

Also, for some textural intrigue, there are some snacks like Mochi puff snacks: https://www.amazon.com/Milk-Mochi-Puffs-4-Packs/dp/B0772QNZ9N or https://www.bokksu.com/collections/september-19-bokksu-moon-festival/products/funwari-mejin-mochi-puffs-black-syrup-kinako. They quickly dissolve from feeling kind of solid. The closest western snack that has a comparable texture that I can think of is puffcorn: https://www.amazon.com/Chesters-Puffcorn-Snacks-Cheese-Ounce/dp/B009IMDTYK/.

By the way, I think what you're doing for him is such a sweet gesture.