John,
If these races have pre Gold AIs, xhy not rather just patch them to Gold ? They will then keep their previous "behaviour".
The process is tedious if done by hand (copy/paste chunks of data) but quite fast anyway (I did 10 of them for B5 mod in say 20 minutes...), and a just graduated (or even ungraduate) programmer could automatize that - I'm just out of time and tools for this
but can make some manual tweaking.