FWIW, "handy" in the sense of "handjob" isn't that common (U.S., over 25). I mostly hear it and use it in the sense of "useful, good to have or know." That's pretty handy, that could come in handy.

Plus, I can't imagine I would ever interpret Handy as a handjob if you pronounced it the German way (Hendy). I would just go "huh" because that doesn't register as a word in English. I've been told that the vowels in the German Handy and the English handy sound really similar to native German speakers. But as a native English speaker, they're worlds apart.

Not trying to change your mind or anything. Just thought I'd give you a different perspective.