I'd do small batch BIAB on the stove. Do 1-2G batches and get some of those small torpedo kegs. You can fit a number of them in a fridge. Do up multiple recipes and invite friends/family over to sample a half dozen at a time.
I'm taking a different approach. I plan on opening a nano as a retirement gig in a few years. I'm using the time between now and then to refine my portfolio of recipes. I'm fortunate, though in that I don't need to make money on this endeavor. I've got $50-75K I can invest without needing a much ROI. That being said, I have a large craft beer group that is pretty serious about beer (travel around the country to go to breweries, brew fests, trade extensively and host share, etc.) and they're pushing me to do it now. Several have offered up $10K each to get it going. For that reason, this year I'm not necessarily brewing what I want to drink, I'm brewing recipes that are candidates for the nano (stuff like a blonde ale, a pilsner, an entry level pale ale, kettle sour, etc.).
I seem to have a knack for recipes. Since going all grain, I've only done one beer that wasn't my recipe and it was the most lackluster of the bunch (still scored a 41 at a local comp though). Most of my recipes come from researching recipes for the style and using elements from them that seem like a good idea...a hybrid if you will. I have a few tenets that I apply to get certain elements for each beer (a nice mouthfeel for stouts, for example....I hate thin, watery stouts).