Many curry recipes I came across involve frying and then boiling vegetables before mixing with roux.
I presume that’s to damage the cells to impart the juice (and soften the vegetables).
However, since I’m planning to freeze the curry, wouldn’t it be sufficient to just blanch the veggies in stock? Freezing in itself will damage the cells and reheating (20 min on medium-low) should be sufficient to complete the cooking.