OK....I'm starting to form an idea of what is being asked a bit better now. Thank you for trying to elaborate on the whole escrow thing, which is, all I have really asked multiple times.
See, you are the first person to have even mentioned that there is such a thing as escrow which holds BTC in currency. Now if that were the case, I do not see why not. Can you answer me some questions though-
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See, that's where things get hard to do. You are doing an auction in BTC, an irreversible, pseudo-anonymous crypto-currency that is not officially accepted anywhere state sponsored and are trying to get the whole protection and guarantees of government debt-money. The two are not interchangeable, you have either/or.
If you want to be sure you have a guaranteed exchange rate and that you don't have to do your own research on who is trustworthy and you don't want to take responsibility over your actions if you make the wrong decision, then you should only work with fiat.
The reason people here are so jumpy about scammers is because the buyer is the one holding most of the risk up to the very end. Sure, bitcoins can plummet, but are you willing to give back the difference if bitcoins rise in value while under escrow?
Yes, John might run away with your 25k EUR BTC equivalent, but I can bet you he has right now and at any point in time much, much more than that being held for others. That is why we trust him, and sure he can disappear, but so can you. He has a great track record, you we don't (yet) know.
As for all other questions about payment processors you'll have to do your own investigation (which goes full circle on this response). If I were to tell you "sure, don't worry, fully insured and such" would you just believe me? I'm not sure at all what the answer is, btw, I don't trust insured companies anyway, as we all know what happens when it is time for insurance to pay up...
But hang in there! We are certainly progressing and even if you end up not selling your house for BTC, this will help any upcoming seller.