How To Change Language Property On-fly In Reports?

Hi all,

I have a question regarding a Language property on Report, Table and Cell levels.
My reports must show monetary values in different formats depending on a currency symbol where the Client resides.
For instance, money fields for USA, Canada, UK are shown as 123,456,789.00 and then "$" or "£" symbol;
but European countries should have 123.456.789,00 format and a Euro symbol.

I have found that XXX.XXX.XXX,00 format corresponds to the Language property = "Italian".
If I set the Language property = "Italian" on Report or Cell level at design time, the report shows the expected 123.456.789,00 format, no problem.
(By the way, for some reason, on the Table level this property set does not work at all)

Unfortunately, I was not able to change the Language property to "Italian" on Report or Cell level on-fly using the following expression:
=IIF((Parameters!Symbol.Value="$" OR Parameters!Symbol.Value="£"),"English (United States)","Italian")
For debugging, I even tried:
=IIF((Parameters!Symbol.Value="$" OR Parameters!Symbol.Value="£"),"Italian","Italian")
But all numbers on the report are still shown in the 123,456,789.00 format regardless the Client's currency symbol.

I don't want to have 2 sets of my reports only because if the monetary format difference.
And also I don't want to CAST the monetary value into a string and mask it myself with dots and commas.

I appreciate at advance any help or comment regarding the issue very much.
This is a critical bug and it must be resolved ASAP.