I see a bit of a conflict. You seem to want a cruiser because it looks "charming", but want something you feel secure on. That can be two different things ...

Back before the 1990's some bikes could be quite heavy and often relied on only rear wheel braking. Somewhere around the '90s some MFGs started to make cruiser styled bikes with aluminum frames, braking on both ends, options for racks, etc. Bikes like the Townie

Feeling secure can come down to fit and features. Maybe go shopping for new bikes and see what I'm saying. Look at features and see what is recommended for fit size, appropriate saddle, etc. Then go back and look at what is for sale locally that matches what you have discovered works for you ...