You're talking numbers and reason while everyone that disagrees with you isn't? That's a bit silly. I cited the size of the Entente's population and industry compared to CSA, Feds, Britain, and Pakt to demonstrate how weak it materially is. That's a fact. The Entente is literally designed to be a second rate power comprised of colonies and dominions of Britain and France. Narratively, mechanically, and materially they're the underdog faction of the game. Nat France has less factories than Socialist Italy.
Look at the possible avenues of attack the Entente has to reach Europe. Let's break this down reasonably.
There's Greenland to Iceland to Scottish Highlands. That's a long round about path into difficult terrain with underdeveloped ports. Once in Scotland it has to fight through the highlands and heavily urbanized Lowlands and Northern England. The population will fight back hard and require taking several major cities in Stalingrad-esque urban battles.
If Ireland joins, the UoB will likely invade once they realize Entente soldiers are landing in Ireland. They aren't dumb. The UoB's Red/Republican Navy is better equipped, larger, and closer to Ireland than the Entente's navy. They're in a far better position to both invade Ireland and fight off Entente reinforcements.
Portugal usually joins. That's great. It's a foothold in Europe. It requires a friendly Spain to reach France, however Spain is likely syndicalist because France is in a good position to send volunteers and equipment to the syndies. That means an invasion of mainland Spain, which is hilly and has rough terrain and infamous for being great for insurgents. Which there will be a lot of insurgents to fight. From there the Entente needs to invade over the Pyres Mountains, which will be heavily fortified and easily channel Entente's undermanned armies into difficult terrain and kill zones. A naval invasion from Portugal to France or Spain around the mountains is suicide.
Algeria or Sardinia to Southern France requires fighting the French and Italian navies and pushing into fairly well defended terrain. France has been expecting possible attacks from the south, so the major ports are well fortified. The surrounding hills and mountains also make it difficult terrain to break out from and the major cities in the south will fight hard. Sardinia doesn't have the facilities to house a massive invasion force, so it's ports would need to be expanded, adding time to the process which the Syndies will see. An invasion into Italy isn't any easier and would also mean needing to invade France over the Alps if a landing actually succeedes.
On the off chance that Belgium or Netherlands are allowed to leave Germany's sphere and join the Entente, congratulations, we return to having to face the UoB's Republican Navy shutting down shipments to Benelux. It's also where France's border is most heavily fortified in anticipation of a German attack, so the Entente will return to fighting WW1 style engagements except with WW2 technology but no manpower or industry to sustain massive mechanized assaults.
You're right that I am biased against the royals in Canada, but you're biased in favour of them, so much so that you're ignoring basic facts. Canadian conservatives did love Britain and the royals a lot, that is true, but the king's dictatorial approach to governing is grating on the Canadian political class. In real life there was a crisis/scandal in which the Governor-General attempted to overrule the Prime Minister Mackenzie King to flex royal power in the dominion. It got shut down hard. Canadians considered themselves British, but that also meant they expected fair treatment and their rights to be respected by the government. Edward's overreach does burn political good will he has in the country.
If Ireland needs allies against a weirdly revanchist UoB they'd turn to
Germany first before turning to the Entente, who's leader is an extremely revanchist British Canada.