I just got an OM1-MkII, which has a "pro shooting mode" that basically dumps the last 2 seconds to the card when you press the button. Useful for sports and animals. But it makes culling a whole job!
So far, I've been using digiKam for that, and it is working, but I definitely don't have that workflow optimised yet...
As an OM-1 MK1 dabbler, I find my hit rate much higher if not using one of the SH modes. Not sure if procap is available with 'regular' ES. But you're right, metric tons of photos to cull. I'll have to give digiKam a go. All I use PM for us culling. There's a ton more it can do, but I'm def not using it to it's fullest.