With 10% unemployment, and the last eight years consisting of a non-stop stagnation / recession (Finland has had zero net GDP growth since 2007) - how would removing workers from the labor pool not crash the economy even further?

Finland is very likely to see its GDP stay at 2007 levels for at least a 15 to 20 year period of time. There's nothing indicating growth or recovery is inbound (things have only been getting worse the last three years). I don't see how it can all be paid for with a broken economy.

Unless the premise is to drop concern for total economic output, and strictly focus on redistribution to raise the median. That seems like a huge leap of faith, unless you can get tax revenues to climb with greater economic growth.