Can you "churn" product changes? A little further explanation, and more specific in regards to the CSR:

I'm passed 5/24, so can't get the sign up bonus, but see the value in the card and my CSP fee is upcoming. Could I product change up to the CSR, hold it for a year to clear the 5/24, downgrade back to CSP or Freedom, and then apply for the CSR and still get a sign up bonus ( whatever it is then )?

Is there any limit to how much you can product change up or down the "same" card?

Just looking for options here. This would give me the opportunity to cancel my Prestige and Premiere, as well, and still pick up a sign up bonus down the line, if possible.