> the EU leaders would use this army to force Hungary to accept the invading wave instead of stopping Muslim and African migrants. <
Such an attempt would be quite possible. But then both Hungary and Poland would mobilize, and call up the reserves. Slovakia might also get involved on the side of Hungary. And Trump would have a thing or two to say about it.
Then the EU would back down.
Not to mention a new German Frei Corps volunteering to serve in Hungary and Poland...the German pot is simmering.