Vetiver would definitely be the way I would go if the climate is suitable.
As Michael said above, propagation is simple and is as he described. I turned 30ish slips into 90m of hedge (at 10cm centres) in about a year.
Make your slip spacing 10cm, no more. I have used it a lot here and that works best for quickly establishing a hedge that will hold back sediment and slow down water. When I plant it I basically pull up year old plants, split them up and plant the slips. I cut the roots and tops off the slips to aid quick establishment. The cut off leaves are placed on the uphill side of the slips and so the hedge starts working immediately.
Here is a pic of my hedge after about a year
I have written about it here - https://practicalprimate.com/vetiver/
I need to revisit the article, it was one of my early ones.