Can't see how a DUP coalition is going to work long term
It isn't a coalition. And EVEL will not prevent an arrangement with the DUP working. The DUP can support the Tories on confidence and money issues which will allow them to keep governing. And the Conservatives have a very comfortable majority in England (297 out of 533 seats) which means EVEL won't give them any problems.
Note that some of the things being said about the DUP rely on quotes from a long time ago and don't necessarily reflect the way the party is today. In any event, because of the make up of the parliament we elected, no-one can govern without DUP support unless the Tories and Labour go into coalition together.
As for Brexit, I would point out to anyone expecting it to be cancelled that parties opposing Brexit lost votes. Over 80% of the votes went to parties that support Brexit. I voted Remain and would be happy if we did remain but I do not think this election gives any reason to believe that might happen. If anything it increases the chances that we will crash out of the EU without a deal.