In fact, I asked that question first in Ask A Dev minutes after Bruza replied for a similar question. And then you asked. I specifically asked for new players as I already had full premium collection. But there was no answer. I was afraid that they wouldn't have figured out the solution for starter Deck and asked asking the lines of 'have you guys figured out how to do that'. Bruza replied saying with MP. It was not clear and I followed up asking how exactly. That was the last time dear Bruza replied. Seriously I am disappointed with how CDPR treats us, the loyal players. I am terribly disappointed by this action specifically. Without a new Post or any announcements about update which everyone was expecting, they updated the original post and made that live. We deserve better and we deserve a better treatment than this.Here is your genuine answer: There was not an official info what will happen to crafting premiums from starter decks as these cards could not be transmuted at all just they were using only scraps to create.
As a new player with limited amount of resources that was one of my questions I would liked to know to plan my strategy before expected change.
I am not mad because I missed converting. I converted everything on the next day of announcement and even today morning, I opened all the Kegs and extracted as much MP as possible. So, I didn't lose anything in the economy, but a little bit of respect on CDPR because of this execution.
But of course, I will continue playing and enjoying the game, with a little bit of disappointment on CDPR.