From my knowledge only Forerunners and humans (Reclaimers) can use Forerunner tech which is why Covenant stuff had to be reverse engineered (very poorly done on the Covenant part) from Forerunner tech they found. Meaning the Elites cannot use Forerunner goodies. So pick, do you want Forerunner weapons or playable Elites?
You are the child of my makers. Inheritor of all they left behind. You are Forerunner! But this ring... is mine.