Moving monthly archives

I’m in a sort of unusual situation (won’t bore you with details) where I need permalink URIs such as

http://domain.org/2006/11/23/slug/

to keep working as they are, but for monthly archives to NOT appear at http://domain.org/2006/11/ . Instead, I need monthly archives to appear at something like
http://domain.org/archives/2006/11 .

Can’t see any obvious way to accomplish this. Is there a plugin or technique I can use to get this result?

Many thanks,
Scot