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@rafalolbert's solution looks like the way to proceed, but I think that you need to parse your data on a character by character basis.
The formula that I used is this.
if ChartoInt([Original]) >65535-256 then
Only apply the code page conversion if the value of the character is > (65535 - 256). I looked, unsuccessfully, for a reference that shows the unicode range for double wide characters. I chose the top 256 of the range because it fit the sample you provided. You may have to adjust the 256 to fit your data. If you do manage to find the actual range, please post it back here.
The middle columns is the result of applying the conversion to all characters. The last column uses the formula from above.