In light of this, I would also not be as concerned about the online coursework unless you were to do poorly in the program. With a 3.8 from a traditional undergrad institution, you will be competitive for MD admissions provided that you do well enough on the MCAT.
If you are committed to pursuing medicine, choose the job that will best help you get into medical school while also keeping a roof over your head. This can be accomplished through a clinical job, or continuing your current banking work with clinical volunteering on the side. I'm not completely convinced that this patient registrar job will be seen as clinical if it's only a "little of both". It will be worth clarifying the exact amount of time that you personally will spend interacting with patients face-to-face, and whether job responsibilities go beyond simply collecting and scanning documents when you do talk to them, etc. Depending on how many clinical hours you've already accrued, this may not be an issue if you simply needed something to prevent large gaps in clinical experience (though one can argue that simply volunteering on the side can accomplish this just as well). Just my thoughts.