5c) I have not yet acquired four years of research experience since completing my doctorate. Can I apply for project funding?

In principle, no - unless you already hold a position where you can independently conduct research (e.g. assistant professor or leader of a research group); the position must be assured for the entire duration of the project (exceptions are possible with regard to positions for young researchers). If this is not the case, the revised Ambizione scheme will be more suitable for you. There you can apply for research funds, either including or excluding your own salary.