Yes, you can graft oranges, mandarins (shiranui, kiyomi, xie shen, dobashi beni, Miyagawa), pomelo (mato buntan, kau phuang, banpeiyu) on lemons. I do that on my trees and get good fruits. My rootstock lemon I graft to is Lisbon, 10 yrs no problem.
I hear the Eureka may not be compatible with some varieties.