Perhaps you could use a nylon stocking over the vacuum nozzle or a
fiberglass screen over the artifact, which is available in hardware stores.
(Like a window screen but more flexible. Fine mesh)

>        I am currently looking for a screen to use in cleaning artifacts.
>We have just acquired a vacuum with HEPA filter and need to find some type
>of screen to place between the vacuum nozzle and the artifact when
>cleaning is necessary.  I have had no luck with the usual product
>catalogs found in most museums and would appreciate any help the list
>could provide me.
>
>Thanks in advance,
>
>Kelly Wilkerson