If you want to go during Easter or other major travel periodd from Scandinavia, you really need to look exactly when the award seats are released So almost a year in advance. Adding to that 3 J seats, really tricky.

You would probably want to split the carriers, so that not all three flies on the same flights, or off set a day or two for one or two of the passengers

If you are looking at SK flights, look at cash plus points options (best availability rather than best point price) 1M eb points should get the cash part fairly low on 3 return J SK flights And you then accrue new points.