Also the rest of the questions is also problematic:
"What do you need from the open-source developers to fulfil the CRA requirements?" → Which Open Source developers ?
"What would you consider if somebody asks you to become a steward?" → Who? On which legal basis? Either we are or we are not, based on the CRA and its guidance.
"In the event that there is proof that an open-source component fulfils the CRA requirements, is there a willingness to receive money for this as a steward (from the manufacturers) or to pay for it (to developers)?" → I don't have any idea what this means. What kind of "proof"? Willingness from whom?
"What help do you need (from manufacturer, regulators/authorities, sponsor companies, vulnerability program leaders, etc.) to fulfil CRA requirements?" → Assuming what?
"Do you think manufacturers must support stewards?" → "must" is what sense? According to the CRA? If it's regulated by the CRA, there is no matter of "thinking". Either it's an obligation, or it is not.