It would help to know why you want to do this? Is it because you want to take advantage of perks for a big trip? Might be worth just paying for whatever you are focused on (pay for breakfast, book a suite, etc.) vs the incremental cost and hassle of getting platinum for one or two trips. If you are expecting to start travelling a lot and don't want to build up status from scratch, look into status challenges where they will provide you with an "advance" on status for say 90 days that then gets locked in once you meet a certain threshold.