A proper way to put code before </head> tag

[OZO]

May be it's already answered, but I'm hoping for a simple answer here.

It's a common desire to put some HTML code (for example, a custom <style> block) right in front of ending </head> tag.

What is the best way to do it with Sidki's filter sets?

Is it something like this?

Code:

Match = "</head>"
Replace = "<style type=\"text/css\"> ... </style>$STOP()"

Note: there is no </head> at the end of "Replace" section. It's because the ending tag will be inserted by this filter:

Code:

"Header Bot Mark: Start - Fix </head>     09.06.29 (multi) [sd] (d.r)"

But what if this filter is 'off'? Or it should be always 'on' with these filters?

Or may be there is some better (proper) way to achieve the simple task?