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Last time we had our roof redone we had leafguards put in, basically the same idea promoted by @Nef, it’s worked like a charm so far (2 years in).
Choosing the right mesh size would be key. -
What about these? Prod them in and pull out if you need to clean the gutter. Would be quicker I imagine and wouldn’t get bunged up half as quickly, if at all.
https://www.roofingsuperstore.co.uk/product/hedgehog-gutter-brush-4m-black.html
Put some sort of mesh over the gap it to stop debris getting in but allowing water to flow into the gutter?