how about metal and  magnets?         neither should  hurt anything 
thin fabric could cover the metal for decoration if you wish -- tape  to hold 
it on the back?
strong magnets will penetrate to work though such fabric.
many magnet choices in hardware and hobby stores
 
metal sheets come in all sizes, can even be easily custom cut to  fancy 
shapes and lengths
I have used a cookie sheet    and also    metal roof flashing for household 
use
 
or
metal and cork fastened to it? Push pins will work great in cork and  it is 
inexpensive
cork comes in sheets of varying thickness and/or precut squares
you conservator persons can comment if cork is a no  no
 
or
insulation foam board accepts push pins -- light weight but sturdy  enough to 
fasten on its own -- 
inexpensive-easily cut and replaced
again a conservator comment as to its problems if  any?
 
Best wishes, Barbara Hass, retired  librarian





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