I may have reached my first stumbling point. Upon looking at the admission application for the community college offering the Japanese course, there are no options for those who want to continue their education by occasionally auditing a course. I checked other colleges in the area, but they don't offer courses in Japanese.
Possible Detour: Buy levels 1-3 of Japanese for Rosetta Stone. Pro: Will be cheaper than two courses. Con: Tried this with Dutch and it fell by the wayside. Conclusion: Might work, as I'm more motivated than I was back then.