Does anyone have any experience of doing this, ie paying directly where there is no agent involved? I have talked to the bank who tell me this is fairly normal practice. The notary has also confirmed they would not manage this process.
Also, such agreements are easier to enforce if they are notarized. However, we never did and it was never an issue.
You will anyway need a notary, so appoint one (you as the buyer have the right to choose the notary - do not accept the sellers notary) and pay the deposit to them. This will ensure your rights (and the deposit) are protected.
If he's honest he'll not have a problem with that. If the seller threatens to pull the sale unless you pay them directly, then you are much better off not dealing with them.
The OP has already said that the notary won't do that. I also disagree with your comment about choosing the notary. A notary is impartial and has to represent the interests of all parties. The notary's job is to ensure that the contract has been understood and is signed lawfully. They generally use a boiler-plate contract. If there are any special terms / clauses, these should be agreed upon by the parties before the signing. Whenever we have sold a property, we have always nominated the notary (in agreement with the buyers of course) and there has never been an issue.
A bit radical and OTT if you ask me, but you are entitled to your opinion.
A notary should be impartial, but if you as a seller are a large client impartiality can be like a piece of elastic.
I've bought and sold many properties here, and while I've been pushed to use the sellers notary on many occasions, I always use mine - and she has saved my skin several times.
I would never advise slmply paying CHF 30k without documentation what this amount relates to