Swapping a Dash 8-100/300 for a Do 228 to improve safety might not be the best idea. Apart from the 228s lack of pressurization and therefore lack of ability to climb above the worst weather, it is certified to part 23 while the Dash 8s are certified to part 25 standards. Those looking for extra gear safety should maybe look at the single wheels on the Dornier as compared to twin wheels on the Dash.....
Without having flown a Do 228 I assume that the general performance of the Q100/300 is better.
It'l be very interesting to read the accident report on the last Q400 accident.
Given the "series" and the reaction of the press to the last incident SAS probably did not have much of a choice. It can't be easy for them to replace 25 A/C more or less overnight. The "5% of pax" in the press release smells like a decoy. Must be a lot more than 5% of departures.....