Joey has Harrison's that I hand feed as treats, because the little goober seems to think they are the best treats ever.
He also has Roudybush in mini and crumble, Zupreem fruity blend and Lafeber's Pelletberries. He prefers the fruity blend but will eat the others with no problems. I mix a scoop of the fruity blend and a scoop of one of the others with seed. I switch up for variety since he does eat them all, but if you found one your bird likes you can stick with one.
I started out hand feeding seeds, using my quietly excited voice I use when I want Joey to be interested in something, such as new foods or toys, and made them seem like something special.