OK, I'll admit it, I'm a bit of a Gyro Gearloose when it comes to instruments, But I actually stole this idea from Chris Wendt - sadly now passed away. He used to get the best (or worst) of both worlds by placing his recorder mouthpiece over his D whistle base. They happened to be a fair fit which he supplemented with a turn or two of masking tape. The sound was much less shrill and he could still do the fancy stuff with slurs and slides. Give it a try. Regards, John