I can't really comment on Japanese engines that are machined to fine tolerances, but it was always a thing I was told, never use flushing oil on old British motorcycle, as once you cleaned all the crap out of them they would 'rattle' even more!
I would just settle for the oil and filter change then change both again after about 500 miles, then keep to regular sensible mileage changes, I believe the secret to long life with Jap engines is regular oil changes. My CRF230 oil is changed every 600 miles and often less, Honda recommend changing every 600, this is due to it only holding 1 litre and having just a gauze mesh filter.
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