Hide currency from some user groups

[Csabesz]

Hello all,
I want to hide some currencies from users,
for example I have 3 currencies with flat prices for each product (USD, EUR and CNY)
some registered users can see only prices in USD, other ones prices with EUR, others prices in CNY
but will be users who can see two currencies or all of them.
I can`t make with child products because I have already use them for other options, dimensions.
The best way I thing sholud be using a module with customizable currencies for shopper groups or
best would be for user groups.
Of course the price after login should be in one off user attached currencies.
Can anybody help me with a sollution?