Currency cross copier- EA function

Trade currency cross - EA function 

Description

An EA  function that can be added into an existing EA. This function will allow  to trade a currency cross artificially, ( let's say CADNOK) by placing two trades making up the original cross pair. ( "USD/CAD"  and "USD/NOK"). Essentially,  the function is a copier of the original cross.

RULES

When the EA triggers a SELL 100k  ( CAD/NOK), the function simultaneously opens two more trades. ( BUY 100k USD/CAD   and   SELL 100k USD/NOK).  Reverse is true.

When EA triggers add to the position or close position, the copier copies.

Here is a challenge: when it comes to pairs with other than USD symbols at a base. the volume ( position size) of the copier pairs will be off if we match the size of the EA of the original position. (Example:  in a  BUY 100k EURGBP situation,

EA will copy and  wrongly convert 100k  EUR/USD and will sell 100k GBP/USD, but the size must somehow match the current rate of exchange. (100k of USD is  about 100k of EUR right now, but 100k of USD is about 86k of GBP right now.) You will need to program to calculate volumes based on a tick value for each symbol so that the  EA would copy positions proportional to the current exchange rate.

 ( example: the EA would correctly copy/convert the above EUR/GBP cross position as "buy 100k EUR/USD"  and  "sell 86k of GBP/USD".

I can give you a formula/ step by step example  how to convert.