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Regarding XCSoar and TopHat integration, it should be possible. I haven't talked to any of their developers, but I think it would be great if they wanted to integrate it.
From what I could observe on the
https://forum.xcsoar.org/index.php (BTW, it stopped working for me some time ago), their reply is usually like: 'Open a ticket' and 'You need it? Do it!'
Don't get discouraged, please. It would be terrific to have the 'targets' on XCSoar. We really don't need yet another display in the small glider cockpit...