Along these lines I think a possible solution would be to give the user the choice of what to filter out.

In their settings page, give them options to filter out the following:

• Javascript
• CSS
• Font customizations
• advanced tags (<layer>, <embed>, <iframe>, etc...) # personally I would remove these all the time
• other tags...
• user customized tag entry

Perhaps each of these could even be set via a dropdown. Where the dropdown contains the minimum level of monk you want the tags to be enabled for.