But they got bitten in the arse the last time they tried to take TP guys so changed policies to reduce training risk.
Can't have been bitten that badly, the current requirements for NTR FO allow turbo-prop pilots.
Minimum of 2,000 hours total flying time on turboprop or jets with MTOW of >20T (excluding P3, rotary and single/multi-engine piston aircraft).
The batch of TP guys they took last time are either in the pipeline to upgrade, or are already Captains.