I agree that everything done to keep OK in the alliance is a good thing, but I don't see at all KE point making a EU hub in PRG with OK. The number of destinations served by OK is very small compared to what they have access through AMS and CDG. Of course, OK can add flights and open new destinations but OK has become an ultra-niche carrier and is literally eaten step by step by LCC. So, relying on low yield connecting traffic from KE seems very hazardous to me.
But, of course, €2.6 millions is absolutely nothing for KE, but there will be much more money to invest after to make this work