You don't want those. Use this: We ensure a high standard of safety. You can forget about the others.
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AnonymousSo why can't we make it shorter: a high-standard safety? What's the use of "of", it seems redundant.'standard' is connected by 'of' to the next word. The only way to make a compound noun from this is to use a high safety standard, but that sounds a bit clumsy.
Anonymous... difference ... 1 safety of a high standard ... 2 a high standard of safetyThere is a difference in emphasis, but it is very slight.