After reading the original post and all of the replies I think I understand what you're trying to do and agree that the thread is gaining complexity, which is probably not what you were hoping for.
It's pretty clear that your management is not help responsible for any 5S activity currently and that you don't have the ability to change that right now - so you can still implement 5S as long as you set realistic expectations for: what it will look like, how to get the employees engaged, and how to communicate to the managers when that happens.
The other thing here is that you may have gotten off track by focusing on the audit part of a 5S program. Audits are fine, but honestly not "make or break"to get 5S going.
If you agree that that idea behind 5S is to prepare your workplace for standard work - as already posted, you will hopefully also agree that what 5S really does is creates a picture of "normal", so that when anything "not normal"appears, it is immediately visible and can be addressed. You don't need audits to accomplish that.
Start with a local area - a cell perhaps and haev the people who work in that area team up to agree on what gets 'sorted'(first S), where things get 'stored'(second S), how the area gets 'scrubbed, swept, shined'(3rd S) and so on. Then share that approach with another small area and once they are both active, you could encourage a bit of competition to see which has a better work area and that can be the path to audits performed by co-workers. As you get more small areas involved, you can improve the objectivity of the checks (audits).
Will your management ever get super excited about this? Unlikely. Will some of them scratch their heads when the yields improve and the productivity or throughput improves - maybe. Will it occur to them how that happened - only if you have a conversation with them about it.
So you need to decide what YOUR motivation is for trying to get 5S going. Is it to look good in the face of your management? Seems like you're in the wrong place if that's the case.
If you're sincere about helping your employees develop a better way of working and creating that improvement mindset, then be patient and keep at it - you'll get there.
Cheers,
Adam