Welcome to the Catch 22 world we all are in! (Well maybe not all of us, but the city people at least...) It is an amazing dichotomy and frustration that arises between wanting and needing the city, and wanting and needing to be as far away from it as possible.
Marc and I are in Boston, and as an example there actually is a homesteading world to be had here. It just is that urban homesteading looks a bit (lot) different that those folks out on the range.
Have you reached out to other like-minded people in your city? Surely they exist! We sidewalk-shufflers all dream of the vast great yonder! Take stock of all of the resources in your area. For example, in Massachusetts, we have an organization that entrusts and conserves property for the alleged benefit of society down the line. Well, one of their programs is a Master Urban Gardener program. Guess the type of people that are in this program? (Many homesteader types!)
So, I say, while you wisely work off your schooling, take stock of all of the organizations in your city that have a homesteader / gardening / herbalism / farming / outdoor bent. And keep pushing the envelop on indoor growing!
Two other thoughts:
1) We bought a travel trailer and stuck it permanently on a campsite in the country, ~ 1 hour from Boston. Think, "wicked cheap summer home" in the woods. Boo ya!
2) You are clearly a successful young man. BUT, it is not too late to change careers. Think carefully about what you really want. Get your cards read (Just kidding!)
Mindy (of The Walking Herbalist)