I actually have a 1998 LS1 Firebird PCM in my garage if you need to get a replacement for the original.
If you are still going the 0411 swap route, you should be able to use any of the Holden Commodore 00-02 LS1b tunes for this.
Once you have the OS on there, you can open the corvette file and copy and paste the spark/fuel values etc back over and make any changes needed manually.
Might be a bit time consuming but I think that would do the job.
I have a fair few of the files somewhere at home when I was searching for a starting tune for my 0411PCM swap if you need one I can send.
Disclaimer: by no means an expert, most other guys here would be better suited to answer the questions, but as an aussie I might know a thing or two about the commodores the others don't