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I don't think anyone would be offended if you wanted to speak to them in Spanish, but if you don't know them, you need to introduce yourself first. This introductory conversation should be held in English, since they are very comfortable using English.
After they know who you are, you can add that you're very interested in trying to learn Spanish and would appreciate the opportunity to speak to them in their native tongue.
(You can use the sentence you proposed, without the interjection.)
If they are very fluent in English, some will allow occasional questions in Spanish, but will not necessarily respond in Spanish. If this happens, you won't get the ear training you need and may want to seek out other individuals that are more accommodating.
If they are willing to take the time to engage in Spanish conversation, you should realize that most native speakers will not correct your Spanish unless you specifically ask for correction. Even then, most will tire of making corrections all the time.
Some will not be willing to correct your mistakes. If you'd like that, seek out someone that would be more accommodating.
If you find someone that will correct your mistakes, they will most likely not know why things are said the way they are. For those types of questions, I suggest you use these forums.
Happy hunting (for the right mix of Hispanic friends and acquaintances)!
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