Wow, it does sound kinda tuff. I'll have to compare the pics to a grassy plant I already gave growing in the leopards yard. It looks similar but not sure it's exact. If it is the same, the leopards don't touch it but it does give a nice hiding spot.https://www.feedipedia.org/node/391
This grows in many places in the SF Bay Area, It makes a thick bunch, almost like a stool to sit on. As kids we would imitate 'hicks' by chewing in its stem. The lower stoll portion is thick with blades of grass the seed stalk are the heaviest stems, as Yvonne points out. You might just try some and see how it goes. Planted is makes good tussocks for tortoises to hide among.