We need a brokerage calculator for Goldcase

Currently Zerodha has a calculator for Equity intraday, delivery etc. But this is not suitable for Goldcase for two reasons. There are differences in how these charges are applicable for normal equity trades and ETFs (for example, STT is zero for Gold ETFs). Secondly, from an investment perspective, one has to also pay for the Expanse Ratio (0.3%) which is not the case for normal equity trades. So I think we need a separate calculator for ETFs where I can exactly get my breakeven point. I am planning to do high frequency large trades in Goldcase with small price fluctuations of say 0.4 or 0.5 points - but I am not able to decide on the brokerage and other charges. Can someone from Zerodha add the Goldcase option in the brokerage calculator?

Why not mcx gold futures then?