Out of curiosity, can there not be something like a two party or N party veto? i.e. requiring a minimum of two or N parties to work together to veto?
The choice between just a single party having a veto power vs no party with veto powers seems a little black and white to me. Happy to be enlightened on the matter.
An N party veto is called a quorum. So if you need 75 % of all countries, it is a 7 nation veto.
Two would be toxic. Malta and Cyprus, or whatever. Three might be viable.