Get the Currency Code from View

Have you tried overriding the theme function used to format the money field?

Nope. You don't need to alter money.module.

On the other hand, you can override theme functions implemented in money.module. These are those functions that start with "theme_". This is a standard Drupal method that can be used to adapt the output of almost anything to suit your needs.

Money fields have a display format that you can select in "Display fields" screen. Each display format has a theme function that is implemented as a CCK field formatter. Just browse the money.module code to figure it out. Look at functions theme_money_formatter_unformatted() and theme_money_formatter_generic(). Each one is related to a field formatter. You can copy anyone of these functions to your theme's template.php and change the prefix "theme" by "mytheme" in the function name. For example, if your theme is garland, then use "garland_money_formatter_generic" for the function name. Now, you can modify the contents of this function to suit your needs, and here you cannot only change the look, but also implement whatever else you may need. You have all the releant information here to perform additional conversions.

http://drupal.org/theme-guide

An alternative to overriding theme functions is that CCK allows you to implement additional field formatters from custom modules. You have an example of this in several contrib modules:

http://drupal.org/project/cck_formatters
http://drupal.org/project/textformatter
http://drupal.org/project/nodereference_formatters

In summary, your request can be solved altering the presentation layer of money fields, and you do not need to modify the money module at all.

BTW, the money_conversion_dialog submodule in this package is implemented as an additional formatter for money fields. This is another example you may want to look at.