Wise words from Khmer1199. You might find all manner of additional horrors inside the timing cover, in terms of metal fragments. It's not a big job to remove it. You just need to fashion a tool to hold the clutch assembly to allow you to remove the basket first. It might even be the case that you have more debris behind the basket itself. It sounds somewhat presumptious of your dealer to so readily identify a bearing as the culprit without a full diagnosis and even if it were, the noise would be constant not cyclical. The noise might also be partly attributable to the tabs on the clutch plates being able to move laterally, as the slots on the outer periphery of the basket are so badly damaged, though it doesn't sound as though that is necessarily the problem.
Once you have scrupulously cleaned behind the timing cover (you need to ensure you get every single fragment out, if found and check all the gears for any tooth damage, however minor), then replaced and sealed it, then replaced your basket and clutch, you are probably looking at at least one, if not two, oil flushes. It might be that you will have to remove the pan on both occasions as well, to check the mesh filter each time. If you repeatedly keep seeing specs or debris collecting on the pan/filter, it's possible the damage extends beyond the clutch area or debris has been pumped into other areas of the engine, though the filter should in theory trap these. Alternatively there may be additional damage internally that is making metal in which case, you will then have a pretty good idea if you have to split the cases, which really should be your last resort. Consider also that in splitting the cases you will need to replace some seals, possibly bearings as well, so costs can rack up very quickly, not to mention labour.
One last thing, it's possible that the "gold" parts you are seeing are fragments of the magnesium clutch basket cover, which judging by your picture, may easily have been ingested into the engine and broken up on contact with the rotating basket, gears, etc. If you wanted to be really sure, there are companies who can carry out spectral/metallurgical analysis of these fragments to determine exactly where they originated from on the engine, which may further rule out the bearing theory.