Brompton P line upgrades to reduce weight.

Hello. I have a Brompton P line 4 speed and made the 5 speed modification. I want to reduce the weight of my bike. I already changed the seatpost to a titanium seatpost. I do however keep the mudguards, and the advanced roller rack.

I was thinking about hanging the chainring and the crank set with the Brompton Superlight Carbon Crankset 56T https://us.brompton.com/p/1018/superlight-carbon-crankset-56t

But I do not know if it is a good idea, maybe I there are other brands or options.

Could you please give me any advice or suggestion??