.....I have an 01 M2 in the shop at the moment.......oil pump drive gear teeth all stripped off, cam gears all have missing teeth and the oil pump is scrap.
Cause of all this was a small piece of front cylinder exhaust valve spring that'd broken away and worked its way into the pumps scavenge rotors, thus locking the pump.
I have a cunning plan to insert a mesh screen into the scavenge drilling via the blanking plug in the sump, thus preventing such debris from making it into the pump.
I'm gonna spend tomorrow sorting a prototype and will trial it in the customers bike if he agrees to it........only concern is that it might reduce scavenge efficiency
Time will tell, watch this space
......and whilst you're sleeping on the option of stripping/cleaning the engine to remove any other resulting debris.......if the screen works, it would mean you could skip that option and keep your fingers crossed a little less tightly 
“only concern is that it might reduce scavenge efficiency” depends on size of mess and how much debris it collects over time ( could just be a case of checking and clean at service intervals )