I've still yet to hear if there has ever been any genuine 5-iai ever made so would probably say you wont get many reponses. Mixing drugs with unknown rare research chemicals is dangerous in itself.
Can't really speculate on whether it would be beneficial.
I would do an allergy test and then work your dosage up with the 5-IAI, make sure it is what you want, and then start thinking about mixing it with something else.
Mixing stimulant drugs with other stimulant drugs is, by its very nature, a dangerous practice.