So, i opened 150 kegs (and still kept almost half of my ore) and got 8 Legendaries, one of them was Premium.
But the best part was that unlike my last time opening kegs, which was on Crimson Curse, now im Prestige 5. Do you know how much meteorite powder i got from milling dupe premiums from those 150 kegs? 2000 Powder!
So, for players asking for CDPR to bring back premium crafting with scraps (which is not gonna happen), a good solution is to reach Prestige 5 and get at least 1 premium on every keg.