I used the lid off a plastic paint pot, cut it to shape and fitted it under the seat, bolted to the exhausts mounting bolts. It's worked very well and doesn't let any more crap in than before.

You could try a modified front fender, cut/adjusted with a mounting bracket, but not sure how it would look. It would be trial and error.

A rear hugger is available, some like them, I don't think it suits the off-road orientation of the bike. but we are all different.

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Never underestimate the power of stupid people in large groups.