Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT Executive, AA, BA, SK, DL, NT, WB + hotels
Posts: 10,260
This is not what you want to hear, and I may be wrong, too, but:
a) I don't think EC261 applies here. When you accepted the reroute with JL, that's when it stopped applying, I believe. You're now flying a non-EU carrier into the EU, out of your own will (or acceptance, at least).
b) Even if EC261 did apply, there's no date change and no overnight layover here, so I don't think EC261 would mandate a more convenient connection. It's still below 24 hours.
But as it is an award, I believe AY could simply remove the first segment. Try that and buy your own OSA-HND? Of course, separate tickets always carry risks, too...
When are tickets moved to airport control? Would it make any sense to go to OSA the evening before and discuss this with someone? If they have control of the ticket at that time perhaps they would be willing to move you to a later OSA-HND flight.