The first answer you got covers consummation issue but the above does not. Above is all very good information, but if you do the online/proxy/Utah marriage, you must be together with your spouse AFTER or DURING the ceremony and show evidence of that when filing the initial petition. In short, one visit only BEFORE the marriage, is not enough to start the process. Since you'll be dealing with a Consulate that sees a high level of US Immigration fraud, the strongest evidence you have a bona fide (not just legal for immigration purposes) marriage is the evidence of the time you spend together in person. If your goal is to minimize travel and time together, you need to change that goal.