Good replacement for hair chewing?

My BCBA and I are both stumped. I have a client who engages in hair chewing. We’re trying to find something similar to his hair texture. He has his hair done in dreadlocks. Any ideas on anything that it similar to that texture that would be a good replacement? For reference he bites pieces of it off and chews it. We’ve been blocking it but it’s to the point where we cannot do anything else because all we’re doing is blocking it.