Thanks everybody for the suggestions. I did not divulge the entire story. I keep my birds at my place of business. I checked with the boss and he is OK with that. (I own the business) My flock is out of the cages all day except for lunch hour. Better than at home where there is nobody. At least one of them is on my shoulder all day long. My assistant also owns birds and her shoulders are also occupied through out the day. The birds get plenty of attention all day long.
I have a full machine and wood shop in our warehouse and I have a good inventory of wood, foam, cardboard and stainless steel stock that I use to construct chew toys. It went into high gear when I acquired Harley. She has a bit of beaver and puppy dog all rolled into a bird body with the inquisitiveness and attention span of a 2 year old child.
I am constantly refilling and building new chew toys for her since she devours them in short order. Like a $45 dollar large chew toy (chunks of 2X4) purchased from the local bird store she can destroy in an afternoon. So part of my routine is building stuff for her to chew.
Shipping pallets are a great source of wood. I harvest them since there is a never ending supply out back. Nice new clean ones to boot. Large cardboard tubes cut into industrial sized "bagels". Pieces of extra thick cardboard. Cardboard corner shields. The cardboard actually lasts longer than the wood. which is pine and splits rather easily. High density foam provides great chewing enthusiasm for dis-assembly. Stainless rods, chains cable clamps and pipes to make bells and other noise makers. Latches, couplers, rope, SS wire are all used and replaced at an amazing rate. Every week I spend a part of a day cutting, shaping, drilling, threading, screwing, clamping and re-filling and inventing new chew toys for her. When I give her a new toy she has never seen before she wont leave alone until its on the floor of the cage.
When she is not chewing on her toys she is chewing on my fingers. She likes to wrestle and play like a puppy dog. I think she has an identity crisis at times. She does know how hard is too hard with her beak. We constantly set and push those limits.
What I was hoping for was to find a material for the perches that would last. I generally use Crepe Myrtle which I harvest locally. Crepe Myrtle is actually better than Manzanita because it does not split as easily. Manzanita is hard but splits so easily.
I will not use a metal perch ever. I guess I will have to just keep my saws sharp and the chew toys ever changing.
Thanks to everyone.
They're pretty hard. Not as hard as Manzanita perhaps, but hard. They hold up very well with my beaver. 
