I am guessing this should be in NFA, but I understand why you wouldn't realize that since NFA is a US law. You may get more/better info in that section.
I don't think that will help much. That metal is just going to take up volume in the suppressor and that will affect the ability of the gas to expand and reduce the effect. I don't think they will act as wipes. YOu could try adding a single wipe to the end. Has anyone tried that "self-healing" target material for wipes?
A wet suppressor will work better than a dry one. Of course, an obstructed suppressor will not work at all.