I really like this. Taking the tune up a minor third will force one to play in keys not ordinarily played in and surely contribute to ear training. In a workshop, one of James Morrison's tips was to put down a different combination of valves or a single valve during his daily practice and start the tune on that note. When fluent, change the valve or combination. Second the motion on stressing out on the high notes. At my age they aren't there anymore. Consider what Chet B did with a couple octaves.