'Turn Up' is one of a variety of adjustable angle stems , there are Others .. My Bike came with one from ITM .

Larry vs Harry - Bullitt includes their EZ Up, in their cargo bike Build.
In one size only.. a shared fleet bike, potentially.
AFAIK you Slot your steerer-tube, which Must Be Steel ..

I have trekking bars I just added a stem raiser to a too short a fork on a Used Bike Buy..

Whole company catalog http://www.satoribike.com/2013/2014c...RI_2014_ss.pdf