I couldn’t agree more with your statement, it is crucially important to understand if there is a fair representation of validators and nodes from different parts of the world.
There are a number of dimensions to consider in maintaining a healthy level of decentralization, and I think the community is understanding this more over time. The canonical model for measuring decentralization is the nakamoto coefficient, of which the concentration of nodes by country is a key metric.
Right now we have: Countries - ethernodes.org - The Ethereum Network & Node Explorer - assuming that all EL clients will be paired with a CL client, this info could give you what you need?
For the beacon chain we have some excellent data from https://migalabs.es/ - perhaps their tools can be leveraged for plotting geographical dispersal of nodes?