Not familiar with Austrian politics, but I can tell you that from the past models, black-blue coalition is a meltdown. If the blue party did not capture more than half of National Council's seats (which is almost certain), the SPÖ, ÖVP and Greens (or the NEOs) would rally around Kern.
------------------------------------------------------------------------------------
It translates to 'The coalition of SPÖ-ÖVP-Green party of Austria promotes priority of asylum seekers! Only the FPÖ stresses "Austria First"!'
From this, we could deduce that any black-blue or red-blue coalitions are not viable options.
Blue party could only be in power if they secure an absolute parliamentary majority.