I have no idea what you mean by premium picks, but the Rams gave up 2 ones, 2 twos and 2 threes, and Jared Goff for Stafford. I think Dak would bring at least 2 Number 1s even with the contract he will sign. People don't pay QBs so much money because they grown on trees or they are worth nothing. If Jerry is going to trade Dak he should expect compensation for a top 10 QB.
I don't think you would get that much plus you have to pay him 60 million.
Most of the recent teams have been burned on these veteran multi year deals (Watson, Rodgers, Carr, Jimmy G, Russel Wilson).
I can't see most team being like "oh it will be different if we trade premium picks for Dak and pay him a ton of money trust us it's way smarter than those other guys".
The only team I could maybe see is the Bears since I think they have multiple first rounders but then again nothing's stopping then from just drafting the best QB in the class and then a top OT or WR with the next pick. Cheaper and younger