I asked for an opinion from a local dirt bike service workshop (the owner is also a semi-pro rider). He said that there should not be an issue with the bearings.
I have flushed the crankcase with 2-stroke gasoline and then, having tightened the drain plug, poured some more gasoline in there.
I guess that there are no hygroskopic material used in the bearings (in an automotive auto transmission, the friction plates do absorb water and swell). Coolant is known to include anticorrosive agents. So I'll get new cylinder seals and try to get it up and running.
If there are issues then, I'll put the bike in pieces and sell the parts. Repair would just cost too much...the workshop quoted 5hrs for the job.
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