Quite a few old duffers on here then! I am with Geoffers on the principle that a lot of old hands in high places resist progress. You are not a real man unless you can fly the whole IR AP out etc.
However I would question why on earth you would want to fly a turn in IMC manually? This is what HDG mode (or higher level) is for. The HDG mode ensures the bank angle and rate of turn is correct, the exit heading is set and cross checked between the crew, whilst the PF is concentrating on the big picture. I suspect those who like to fly IF procedures manually also like to go home and whip themselves with nettles.
If you look at the FMEA it's effectively impossible to lose HDG mode whilst the AP continues to work normally in ATT so there is no need to maintain such a Luddite and pointless skill.
Whilst the 225's AP is excellent in nearly every way, it is surprisingly difficult to hold a steady angle of bank against the springs, much harder than the L or L2. Apart from anything else it tends to be quite wobbly-uncomfortable for the pax and a moments distraction risks large angles of bank. It is ABSOLUTELY NOT the way to fly safely.
Trim into the turn if you must, but why bother?
Personally I always flew visually with the cyclic trim pressed (if I was moving the controls) and if IMC, I used the buttons, which is what they are there for.