How can I shorten the straps on a dress with some sort of fastener or minimal sewing?

My crummy solution: The straps are wide, maybe 2” and I thought maybe I could cut them and then hand sew them back together at the right length and cover the seem with a funky button. The dress is a funky print and I think that could work, but if I screw up then I’ve ruined the dress.

Are there any little gadgets out there that can gather the fabric and hold it in place in a somewhat fashionable manner?

My sewing machine is broken.