Technically you could determine an angle on an NPA from the TCH+50' back to the FAF. Problem is there is no way to fly that angle with "raw data" that I am aware of. The Airbus bird and FPA can fly any angle but it is not raw data and still an NPA. Steam gauges (likely some exceptions but for demonstration purposes only please don't crucify me!) can't fly approach angles. Also the approach could be flown differently (dive and drive vs SCDA).