I think you hit the nail on the head a set of pannier frames/rear crash protection that isnt pannier specific that would allow you to strap/hold soft panniers from flapping into the rear wheel

I couldnt find anything off the shelf that wasnt �150 + so i ended up making my own. Yes they are a bit heavier and not the same quality but they cost me about �20 including a big thanks to help from my dad.

Apart from that most of the other mods ive done are all stuff already been looked at by other manufacturers

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Plough on