Designing a race that favours certain weapons isn't a problem - just look at the stock terrans, for example, who use lots of missiles an fighters...
(Of course, I say "isn't a problem" like I have some sort of experience with AI modding. Never tried it myslef, but I have a pretty good idea of what's possible and what isn't.)
It isn't much effort; just fiddle with a few weapon family settings in DesignCreation, change the techs from the old weapons to the new ones in Research file.