All products that has a FX impact must go thru Treasury. There is no exemption. Gold is not mined and even its is mined here prices are a function of global price.
Private banking is a sales and servicing arm. Borneo motors does not manufacture Toyotas.
All products offered by a Bank to any customer including high value customers on an exclusive cannot be kept be confidential. What is kept confidential is preferential pricing and servicing structure. Peferential pricing does not include product yield. Commission, fees and portion of profit is where customer can be offered deals on personal holder basis.
Any fund, trusts, etc must be published on a daily basis as price moves daily.