Unfortunately, I don't know of a way to start the debug of an EGL service at the EGL source level except with the stub.
After further checking, it seems the debugServletService does expect the data in a format that the EGL Javascript knows to produce and has expectations on how datatypes, etc are handled. This not necessarily the way a non-EGL client would pass them.
So, you could submit an RFE, but don't know if it would be possible to start up the EGL Debugger on a service request.
Mark
markevans