I massaged down the price to 1,9k€ BUD-HEL-NGO//ICN-HEL-BUD all on AY metal. Of course there's the TYO-SEL to add to this, but I'd need to be in both places anyway (and also need to get out of and then back to BUD!), so it's quite alright, no "extra" legs.

If I were TP-hungry, the TYO-SEL could be done on JL, but I'll just go with whoever has the best price/timing HND-GMP.