My experiences with French notaries is that they don't give you any choice. The buyer must pay the notary fully or they don't do anything. After the sale, the notary pay the seller. If someone knows another way, please give the name of the notary who allows it.
Actually, I like to do things this way. It's very secure for both buyer and seller. Proof of payment is kept by the notary. Elsewhere, the buyer pays the seller directly with the notary keeping all details of the bank transfer, but the French way is more secure, and more and more countries are adopting it. And that rules out any payment in cryptos.
If retailers in France don't accept bitcoin, it's because accountants aren't trained and don't want to get involved. If notaries don't want to transact in bitcoins, it's for the same reasons. But as long as you pay your taxes and the notary in fiat, you can buy your property with whatever you want, as long as the seller agrees. However, the property must be at the "right price", otherwise there's a risk of a tax reassessment.
Here the notary says that if you pay in bitcoins, you avoid the Flat Tax, but I think he's wrong: when you buy a property in bitcoins, you normally have to pay capital gains tax.
https://www.bfmtv.com/immobilier/est-il-possible-d-acheter-son-bien-immobilier-en-bitcoins_AN-202105190634.html