When I was a lot younger I mighta gone for a long screw. At my age, "Safety Wire" (well, anything with the word safety, actually) sounds more logical. A cross pattern through the center of the rubber couple should never need to be removed.
I opted to go with this:
Uni-Filter
for a couple of reasons. I thought it would provide far better pre-filtration than the wide plastic mesh Honda provides (which would stop large bugs and small birds, but little else). It would also provide redundancy in the unlikely event the main filter failed).
I was concerned it would be too restrictive, but it works great so far (shown before oiling . . . though even dry it would filter better than the stock mesh).
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