If you are going with OS 2.0, why not 2.1? It was sold as a complete upgrade across the entire product line (except CDTV).
I believe 2.1 was more stable and complete than anything that came before it, I still use it on many machines (including an A570 with ScsiTV). Unfortunately, it was the first release to ship without the Say command and the associated libraries and devices. Copy these over from 2.04.