As other answers and comments have said, this is a bad idea. A risk/benefits analysis shows this clearly. You risk your reputation/self esteem for very few benefits.
First, let's say you go ahead and apply for these programs, you're accepted and you turn them down as planned. What are the benefits? I don't think you can realistically add them to your CV because they're partial achievements (you didn't attend/complete the program). Even if you could, don't you have greater/better achievements that could take up that space on your CV? So, what do you gain? Experience in the admissions procedure (which may or may not help in a different continent), an "aside" to mention in an interview. You should only mention it at an interview if the offer is still open, otherwise you may be seen as more likely to turn down an offer or, worse, naive for rejecting a decent offer.
Second, let's say you apply for these programs and are rejected. Fear of failure is never a good reason to avoid something, but rejection is a real risk and will probably impact your ego. A needless rejection that you would have turned down anyway has no benefits and absolutely risks your self esteem.
The only reason to apply for these positions is to benefit yourself. If you want a back-up position and the dates work out, then apply. If you want experience and feedback from the application procedure, then it might be worth a trial application, but you should make it one that you would at least consider accepting. Otherwise, spend your time more wisely on things you CAN add to your CV - volunteer for charity, give up your time to moderate a web forum, read....