Did you read: http://www.ajaxplorer.info/wordpress/documentation/chapter-introduction/

It requires a Webserver+PHP while it is possible, it will be difficult and it will suck up the routers ressources:-)

Why don't you want to use WinSCP?

You can give it a try, won't harm. What you need to do is connect some external storage to the usb port, add at least one partition formatted with ext3. Then activate jffs set the moint point to /jffs after that you will be able to use ipkg to install apache and php.

After that you need to edit the configs/init scripts of apache/php in /jffs dir.
If that is done you can try to start apache and see if it works, I noticed that not all packages fetched by ipkg work, since I haven't tested apache,php I can't tell that these packages work