I wonder if maybe some large, thick cardboard boxes could be used to cover the glass, or use some 1/4 inch plyboard (like paneling) to prevent anything from hitting the glass. Might be costly but it might be possible to entice someone to grind of the coating you have if you were to provide the materials; might also have to sign a waiver of damage claim. Other option is to maybe have ceramic tile installed if the "knockdown" isn't too uneven. Or, yes the thin leveling coat (thinset) might work also. T&D might have a good product/suggestion.
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