Could eat daily , usually use chicken, but 2 vegetarian guests.
I have thought of just more spuds to replace the meat, one eats fish so could add prawns at end?
other ideas
1 Tofu to help absorb the rich sauce
2 Paneer labneh or Feta in deep fried cubes? may go soggy
3 Large Mushrooms not easy to find here, tho I've seen canned at Lotus and Tesco
4 Some variety of Pumpkin and Squash grow here but thought may just dissolve
So all you curry wallahs any experience with above
Could also bulk out with raita sides yog , tempura poopadomes Nan etc?