Are you sure that you'd earn 60K? The Flying Blue Miles Finder on the KLM site suggests you wouldn't - 5.25k is the most that can be earned on EDI-CDG return, in the 250% earning biz classes, with the Platinum bonus. Travelling in First on CDG-NRT return, and again with the Platinum bonus, you'd earn 48,256 miles, for a grand total of 53.5k, an absolute maximum possible total. (Your profiles says you're FB Gold, and the same 250%/300% earning classes would net, with a Gold bonus, 50,114 FB miles)
You can buy up to 100,000 Flying Blue miles (i.e. without having to fly at all) - though 60k costs €1,500 and the full 100,000 costs €2,500.
We've all assumed you're talking about Award Miles here - not Level Miles.