Pre-cooking doesn't necessarily involve freezing and thawing. What you've described Ox is a simple method that I have used in the past and will again in the future.
I now always use the method you describe with a diluted Base Gravy to pre-cook chicken when I'm making Mango Chicken or other lightly spiced creamy dishes. I've found that full spiced pre-cook is not suited to the dish, which requires a very lightly spiced base gravy as well.
If I'm doing BIR style preparation I typically pre-cook chicken, lamb and vegetables. I usually use it all straight away, or at least from the fridge within a few days. I've rarely had the need to freeze any of it. For full-flavoured dishes I am a big fan of Misty Ricardo's methods but I also like the Kushi recipes and I've tried a couple of others including those from the different Balti books I have. These all produce perfectly acceptable dishes. The Balti Secrets 1 methods for "Par-cooked" meat and chicken are very basic. Nothing too fancy at all.
1 The Balti Secrets of the Birmingham Balti Company by Janet and Peter Lardner, 1997.