I think the easiest way to do this would be to edit the template and adjust the references to the menu in here. You can identify any where the cssmw_content is referenced like this:
And update it to point to the cssmw_home menu like this:
You would need to make sure you do this for each of the references to the menu directory on the template. This would get you the same navigation on all of the pages. You can also do the inverse of this and use the cssmw_content menu on the index page to make that one like the others in the site. The changes you would need to make in either case would be just about the same.