Hi,
You could maybe allow simple macros only - see
DevGuide - web.config parameters -
CMSAllowOnlySimpleMacros key.
If true, only simple macros (i.e. those which do not need a security check) are allowed. All others will not be resolved. If true, CMSTextBox does not add security.
The default value is false.
Otherwise, you'll need to handle it either manually, or using some API (or DB script)...depending on the scale and number of places where it would need updating.
Regards,
Zdenek