Welcome dianed, glad you could join us.
Risers yes several members have added risers to an M50.
Too wide? That seems like a personal comfort issue, sit on an M50 and balance it under you. How does it feel? Can you stand flat footed? It can also be lowered by as much as 3" without too much trouble.
Another idea, several forum members of shorter stature really like the S50/Intruder 800. My dauther is about 5'3" and rides the Intruder 800 with no problem what so ever.
Ride safe, let us know what you decide.