Scrapers made from the items you mention are too soft for extended use. They will not hold an edge.
Though glass is harder than bone or antler, it will chip, leaving small bits of glass in the stock. It's also hard to shape.
IMHO, Bone and antler make good burnishers, but not good scrapers.
A dull chisel or screwdriver will not scrape, they need to be scary sharp to work properly.
You can make your own scrapers, depending on what equipment you may have, from circle saw blades, hay rake teeth, or any high carbon scrap steel you can find. Old worn out files bought cheaply at yard sales also provide good steel.
An acetelyne or a mapp torch will probably be enough to heat the scrap steel for bending or shaping with a hammer. A decent grinder is necessary for stock removal. Hardening can be accomplished with a torch, or with a home made forge.
An internet search on "scrapers", woodworking tools, or some such should bring up tons of information on scrapers.
J.D.