[potato3732842]

I don't see how the BNPL interest free period helps you here. It basically just delays your withdrawal so you get 6wk (or whatever) more return on the few grand financed. And if you maintain a constant balance the effect is going to stay the same, not increase or decrease, so it's basically the same overall effect as a one time contribution of the financed amount, which is probably very small relative to portfolio size for anyone who ought to be doing this.

The way you can use CC points is well documented but it stands on it's own separately and I don't think it adds anything but confusion to this example.