Although definitely not the only way to achieve your goal, there is a long-established tradition in aircraft ownership (works on cars and boats too), where you can substitute time and elbow grease for money.
You can buy any number of Pacer, Tri-Pacer, and Stinson projects that need rebuild or repair for ten or twelve grand, and put in several thousand in repair/refurbish materials, and a
bunch of your time, and come out with a freshly done bush-capable airplane for $30K.
If you are interested, you can scratch build the 701/750, and have a brand new purpose built bushplane. If you install used, standard, non-exotic instrumentation and a hand held radio, and buy a mid-time O-200 engine, you should be able to get it done for well under 30K.
There is a dollar value to your time, and if you value yourself at 20 or 30 dollars an hour and counted that toward the "cost" of your airplane, then you would come in
way over 30K of course. But if you have plenty of time, and a lower-paying job, meaning the money out of your pocket on a daily basis is the limiting problem, then consider it. Scratchbuilding allows you to finance the airplane over a much longer period of time, with no interest, and the ability to not spend money at times where it is needed elsewhere.
You can also "scrounge", buy surplus materials, surplus aircraft hardware, etc and save a lot of money. Again this is not the "first class" way to do it, but I can assure you that MANY homebuilt airplanes have been done successfully this way. The scrounging becomes a hobby and passion of its own, and yes it takes time and energy in and of itself. But reading old copies of Sport Aviation (before it was dumbed down

) will give you many inspirational examples of this. A recent issue of SA about the classic Wittman Tailwind reported that you can still build this exceptionally capable airplane for 25K. The Tailwind is of course not a back country airplane... But the
principle of a scratchbuilder being able to have a fast cross country sport plane at one third of the typical cost of other "quick build kit" builders will be as valid for a STOL airplane as it is for a Tailwind.
Also consider the value of your time at your normal "day job", and calculate whether the money you get paid to do your job is a lot more than the money you would save by building or repairing. Because another option ,of course, is to figure out whether you would be further ahead by taking out a bank loan for 30K to buy a flying airplane. If the loan payment including interest is something that your job allows you to pay off faster than the amount of time you would have been building, then you might own the airplane sooner... and the added benefit is that you have been flying the plane all the time you were paying off the loan.
The other poster was correct in that it definitely would be much easier to spend more than $30K to achieve this goal. However, if you cannot spend more than that, please do not let that become a barrier to keep you out of this sport. With extra effort and a little cleverness, you can do what you want to do.