Update of EA211 cooler?

I realized that EA211 uses liquid cooler instead of air cooler, so it seems to be few options avaliable on EA211 cooler.

Are there any interesting update solution on EA211 cooler?

none that I'm aware of

Is there room for a larger or higher capacity heat exchanger?

You could probably swap the main radiator for a bigger one, for example a Golf R radiator,
perhaps along with Golf R auxiliary radiators left and right, but I don't think that's worth the
effort, as you'd need to make space for them.
The air/water IC itself - I don't think there's a 'better' one out there. I don't even think it's
necessary.