As the article clearly states this proposed move would be in the off-season to be ready for next season. There are many things to consider.
First, Jax has stated he would like to make the move. This obviously has something to do with starters being paid better. There might be other factors since the work regimen is so different. He might miss the routine of a starter.
The days of the Twins scrounging the dumpster for starters seems to have passed. They have young talent coming. Considering they don't like to pay retail for relievers, the bullpen will present more of a need next year.
Will his stuff play? If he keeps his stuff up, will his health continue? Jax has been very reliable, arguably the most reliable reliever during his tenure. How his stuff and health react to a move are unknown.
Who moves to open a spot? SWR may never let go of his place. Pablo, Ryan and Ober are entrenched. That leaves Paddack. At 7.5 million next year he may have priced himself out of a role in the Twins meagre bullpen budget.
With Jax's work ethic it is intriguing to see what he could become. He is the Twins best candidate for this move ( I wouldn't trust Duran to hold up). If the Twins were willing to spend on the pen then maybe. As things stand I would take a hard pass on this.
As a side note it is curious that Driveline's brass would promote something like this. They have a relationship with the ballclub to maintain. Are they over stepping their bounds here?