I second that, I think that in your circumstances you should go with the other one, since you want a finished, ready, and totally liked instrument, not a project (unlike me who often go for projects rather than finished products).
The most specific part of the risk is this:
Khuja Wangtishvili Question is hot it will sound after, and in my opinion it will have some change in the tone from original state, to which I do not have idea.
Yes, most likely there will be a change. Maybe not a dramatic one, but some change. And given how particular you are with your tastes wrt sound (*) you run the risk of not liking it after the repair. I agree with everything else @Khuja Wangtishvili said too, but I think this is the big-deal or deal-breaker for you to not go this route.
Now, if instead you are changing your mind and you do want a project (of uncertain result) rather than a finished instrument, I suggest that you purchase that upright @HZPiano found in a thrift store. Even with the 6-hour transport, that is basically free and has a lot of potential (**) -- and let me repeat "potential" which means that per se it will just be a piece of furniture, but with a right technician with the right skills and lots of work in a non-negligible time it could become better than many others. But again, it's a project, not a complete instrument you'd have to play immediately.
Again, best of luck in this journey!
(*) just to be clear since neither of us is native English speaker: I'm not implying anything wrong with this, in fact it's quite the contrary, i.e. appreciating your selectiveness
(**) one thing that pianos of that vintage have, their soundboards were build with wood that grew in a "better" climate (better for musical results, at least). Slow growth, denser rings, etc. Much of the trees of that category are gone, and the ones that are left are under some sort of environmental protection. The "sustainably grown" ones are grown under the pressure of fast profit, which often means in climate zones where there is fast growth, and less dense wood with larger rings per year, which means less musically appealing. I mean, not necessarily bad, but not as good as the old ones.
