Was wondering what platform/method people would recommend to avoid losing the arm and a leg that ASB charge to do this?

Here are there fees below, Additionally, would be the astronomical FX charges on conversion back to NZD which aren't mentioned. All in they could be cutting your lunch by 3%+
United Kingdom trades
minimum of 50.00 per trade plus agency fee of 0.4% with a minimum of 40.00 per trade (Orders up to and including 50,000)1