Like PaulP says, the obvious option would be to make your fav BIR sauce and add some pre-cooked veg, you can really choose what ever you like best. I agree that veg korma is not the most mouthwatering, but I would imagine if you choose veg carefully a korma could be an option, e.g. cauliflower?
What I have made in the past is non-meat curries using pulses such as 2/3 varieties of lentils and/or things like red kidney beans - can be a bit more substantial than veg alone?