MulTool is actually independant of any emu. It does use the wsc file format that is designed for (older) UOX, but that doesn't mean you can it here.
Basically, you are wanting to export some statics, change other aspects, then refreeze these same statics back in. No editing of the actual wsc file is required, so it's fine for what you want to do. Really, for all you care, it could export it into an excel speadsheet, as long as it imported it back in intact, which it does.... for the most part.
Now, you're wondering what that last comment is, right? MulTool does work as advertised, 99.99% of the time. There are aspects of the program that do not work, like the bmp part and art part, but these are not used anyway. But I've had a couple issues of exporting statics in the past., so I can't say it works 100% of the time. What I do recommend is use UOCopy to export the statics. I've never had any problems with, and it too, uses the wsc file format. However, since all it does is export the wsc (for this) then you'll still need to use MulTool to clear the respective area of the statics that you exported with UOCopy. And when you are done, you'll need to use MulTool to Freeze the wsc back in as well.
I've probably confused you, but I wanted to make everything perfectly <STRIKE>muddy</STRIKE> clear.
One final note, WorldForge does work perfectly well also, but personally, I only use the MapEditor. I've not used the statics portion of it in well over a year now.
-Ryandor