If you want to do this legally, which is the only way I would recommend, then there is no expedient method.
Arguably, some people say the spouse visa is less time overall, and better in terms of gaining a green card/work auth/paying less fees to the government. However, it's hard for some people to wrap their heads around the idea of getting married then sorting the paperwork, forcing couples to live outside the US (sometimes together, sometimes with the USC back at home) for upwards of a year.
The desire to avoid that and do the K1 does come at several costs: monetarily, logistically, and time-wise. Ultimately the choice is up to you.