Is it possible to pre-compile your asp binary and re-deploy?
IntelliTrace file debugging is kind of Like dump debugging, PDB will make the life easier by potentially pointing you directly to the source code, but without that you can still get a lot of useful information from the file.
Are you able to see a "Summary Page" when open the .itrace file? Where you should be able to find a list of all the exceptions. When start debugging one of the exception, even without the pdb file you can still make use of the other debugger windows like locals window and call stack window, and you should be able to see the exception and other related events in IntelliTrace window.