[nickff]

If you can design and reliably manufacture re-usable PPE, I am certain there would be a market for it.

I design some non-medical mechanical assemblies (various types, for use with electronic equiment), and have no idea how I would design (reliably manufacturable) re-usable PPE for use in a biohazardous environment. As far as I can see, the problems would mostly be in the joints and fastening features between different materials. Some features (such as filters) will likely need to remain at least somewhat disposable, as I believe that all biofilters have a limited lifespan.