Another nice option for you might also be a stadium tour for 45 minutes starting 3 hours before the match.
The tour on matchday is the one called the "Fan-Tour"
(
http://www.alemannia-aachen.de/tivol...stadiontouren/)
The website with the description is sadly just in German but the so called Fan-Tour on matchdays would include the following:
It takes 45 minutes and the special thing is that you get to see some of the match preparations that are going on behind the szenes.
it includes the business area with the vip boxes and the side of the field with the players bench the mixed-zone and the press room before the match.
the prices for the tour are 5 euros for kids (up to 14 years of age), 10 Euros for club members and 15 euros regular price.
and it starts 3 hours before the match and takes about 45 minutes.
If you're interested in such a tour you could fill out the german e-mail form
on the bottom of the site in the link ( if your German is to poor to know what to fill into which field have the website translated by google) or you could call the hotline (01805 / 018011) from germany. Or send a fax to 0241 / 938 40 369 (outside of germany internationally the fax number would then of course be: 0049 241 938 40 369 )
You, could certainly ask if they can arrange for a guide who speaks english well enough or if your group is large enough maybe even for an all english tour if that's possible and not on to short a notice since its of course less than a week until the match now.