I know that starting a whole practice under a traditional model is an expensive proposition, both financially and in terms of your time and other resources, but most of the services a UC offers can be provided with little more than a stethoscope, a lap top, and a private room... and on a time limited basis.
If you are only working 6-10p at the UC anyway, why not see if a local gym or fitness center will rent you a room to use for a wellness clinic for a couple hundred a month (or, heck, even pay you that for being a unique additional service that they can offer!) Arrange at least one or two regular times per week when you would be available to see patients for minor issues. You can get most of the equipment you need for a few hundred dollars, if you don't already own it. Labs and imaging, write scripts and send them out to get those done. Use a messaging service ($20/month) to manage your calls, if you don't want to just give patients your cell phone number. Accept cash only, with a discount to gym members. Patients can do walk-in appointments, or self-schedule via web or phone app (that can be free or very cheap to set up.)
You can advertise separately from whatever the gym does to promote your clinic if you need to, but it is likely that you can build a reasonable panel just from existing gym members who want support meeting weight loss goals or who have minor injuries, etc. This benefits everyone, since patients who establish with you in this way may be more likely to keep coming to the gym, and new gym members may be drawn to join because they can see their doctor there. And you can directly observe your patients during a workout, and be able to give immediate feedback and recommendations.
No staff, low overhead, low hassle. You could be providing a service that is convenient for mostly healthy, highly motivated patients to be seen for routine care, where you can charge less for an appointment and end up taking home a lot more than when you were working for hire.
This is something that a midlevel can't displace you from. It is scalable, so that if you want it to, it can serve as a springboard to a larger practice, or stay a side-line while you pursue other opportunities. It is a sketch of one of my possible future business plans, feel free to steal it if you like it. Since I want to spend a good portion of time serving people who can't really afford to pay me much of anything, I have these schemes for ways to maximize my income where I can. .