When my sister got married last summer, she had two friends she wanted to officiate. DC does make the officiant process difficult, so rather than going through that, she just got officially married at the courthouse and then had her friends officiate the ceremony at the wedding. They were legally married by the court, but it worked for them. And for what it’s worth, DC actually is pretty efficient with the courthouse marriage ceremony. It’s not a beaurocratic headache like some other things in DC and I think the ceremony at the courthouse only took 15 minutes or so.