Maybe... (just thinking loud) one possibility may be to pick up some popular unmaintained open source project, and write alternative replacement in U++ from scratch. But I have no idea about what project that could be, maybe some front end cross platform client for some open messaging API, like jabber/gtalk, including video calls, etc? That may have impact over larger user base, but looks like lot of work just to get it going, and without heavy maintenance it would probably die soon after.