Wouldn't the French Algerians at least be very interested in the Portuguese development?
You are correct to think that French would have most to gain from Portuguese federation model. The issue is in the 1940s would they need to? Or better yet would they feel they had to?
To understand that statement we need to review the prevailing attitude of the remaining colonial powers after WW2.
Britain- has never accepted the integration of its colonies including European settler colonies or dominions such as Canada and South Africa into a larger United Kingdom. After the war it accepted the need to grant most if not all it’s colonies independence. This had started in Asia with Middle East and indian subcontinent.
There was no desire to bring to Britain tens of thousands or hundreds of thousands of colonials. So Britain was not about to take any lessons from Portuguese.
Dutch - their largest colony, the Dutch East Indies was tearing itseft apart and Dutch were helpless to stop that. Only thing they could was to help a few of the countries that emerged from the war as best they could. Their remaining colonies were in the Americas. Would they take any advice or lessons from Portuguese? We wait and see.
France - this was one of the countries that could take some lessons. The French at end of WW2 were not prepared to let go of their Blue map and were fighting very hard to reclaim French Indochina the one part of their empire trying to become independent. In the 1940s French believed there was no problems with their French colonies and possessions in Africa and it would take the outset of the Algerian colonial war and loss of French Indochina in the 1950s to wake the French from their complacency.
Lastly want to touch on few major differences between Portugal and the other three countries mentioned above:
1) democratic vs limited voting - the truly democratic countries where each vote was same that tried to incorporate the people living in colonies would soon find themselves feeling power was being taken from them by the larger colonial population. On the other hand Portugal voting was controlled and the choices limited. Even opposition parties who started to appear had to adhere to basic concepts of federation and territory integrity in order to be part of the election process. So like communist countries that theoretically provided universal voting franchise but controlled government by limiting whom people could vote for. So too the Portuguese can nominate Africans and other non Europeans willing to work within the system as viable candidates for people to vote for. Meanwhile in French or British democracy independence or extremist parties are permitted and thus very different outcome would arise. So hard to see same concept arise in those countries.
2) economies - both Britain and France had very large industrial economies and large populations in Europe and their colonies were for most part underdeveloped with resource and agriculture as main economic activities. The Portuguese industrialization started much later and due to lack of resources, infrastructure and smaller population base had started their industrialization in both metropolitan Portugal and overseas provinces at almost the same time. Economic opportunities, smaller size and development had also forced them to disperse the Europeans people throughout the country. Iotl there was only 800,000 Europeans (aprox) in all Portuguese overseas provinces at time of 25 of April 1975. Here as we will see in the upcoming security section the European population is already double that by end of the 1940s.
3) Another aspect that we need to distinguish is the economic weight of the overseas provinces against the metropolitan Portugal and compare it to the relationship between France or Britain and their colonies. The actual numbers and comparisons will be discussed in future posts but I can now state that Portuguese numbers are 2-3 times higher than with France or Britain. Meaning the economic activity of the overseas provinces are much bigger percentage of the country’s GDP than say the other two more industrialized countries.