Why everyone is supposing he will stop at lower levels?
Of course, if he likes the gk, he will try to take it to its highest lv. Dont know how, or if its faeasible, but he can aim.
Once he reach 99, the 119 is cake. Riftborns and beitetsu are the cheapest. With the current price, he just need like 10m to get to 119, while a relic would take ~100m.
And one can hope on the future SE can nerf those trial, or by increasing drop rates, ease of proc system or by adding another places to drop hmp/cinder/dross. Just give a little help and soon empys will become more feasible, amd riftborn will be more wanted. Now is the time to get them.