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Cheers, your suggestion looks a lot like it indeed. I do not have any tool with which I can unscrew that sleeve, yet, and I'm having a hard time finding them.
Of the left bearing, only some balls and the outer ring are left. I can't seem to get that outer bearing ring out, so the whole sleeve has to come out.
The crank fitted to it was a Shimano Ultegra (Hollowtech) so I imagine it must have had some adapters like these fitted to go to 24mm, but they were ground to bits by my friend :D
What happens if you get two BB tools on it and unscrew it?
If the bearings were 30mm ID then it's either a PF30 or T47 shell. You'll find out when you get whatever's left out.
This looks like it or similar.