So we had a similar case with us. Due to an imprecise wording, my uncle would have had a claim to the property of a house bequeathed to me. It was about the fact that my father could only sell with the consent of my grandparents. This right then transferred to my uncles depending on the interpretation.
Our notary then found the correct passages from comparable cases and this was accepted by the land registry office and the house was transferred to me. This would also have worked without cooperating with my uncle. If that had not worked and my uncle had not been so understanding, according to the resourceful notary, the matter would have had to be settled in court and, in the worst case, he would have had to be paid off.
The problem then is indeed that all parties must agree on the price and preferably independently. An independent appraiser/arbiter costs a lot, after all. I can only really advise to communicate openly and find a decent real estate agent who has relevant experience with complicated communities of heirs.