Lars, it sounds like what you may be asking for is John Sequeira's
portable.nsd.
The advantages of portable.nsd is not just that it will allow for the use of other webservers but that it will allow for very small installations of oacs and development from tclsh.
Perhaps even better for many, portable.nsd will allow for clean and complete use of TclPro (http://activestate.com/Products/Tcl_Dev_Kit/?_x=1). In fact, John's been developing portable.nsd using TclPro and has been raving about it.
So I think this might answer your problem, plus solve a lot of other things.
talli