Had a look at the pre-info AB has on its internet site. As topbonus Gold will equal OW Sapphire it might be pretty simple to reach, taken that the levels will remain (silver 20k, gold 40k).

I fly practically weekly HEL-BER/FRA. If I only changed slightly my preference of direct HEL-FRA to via BER w/ AB (and distributed FRA and BER equally) after 8 RT I would reach silver status and with the help of its 20% bonus after 7 additional flights I would reach topbonus Gold.

And probably all this for cheaper tickets than if booking at AY (even on AY metal).

I don't even care to calculate how much I would have collected in AY+, definately not the needed 90k.

Now, one needs to compare the AY and AB OW Sapphire statuses but as the question was how to reach easily OW status at least it appeares that AB might be good alternative to AY+ for Finns and takes one pretty easily to OW status levels.

And if calculated correctly and the topbonus Platinum level stays at 100k I would reach it after addtional 18 HEL-BER/FRA flights making the total amount of needed RT in a year 33.