POD for Confederation of a larger British America.

So basically, this is the premise: I'm working on a fairly expansive timeline based on the Yankee Dominion project I started. In this timeline, there are a few key differences from the world created by the project's contributors, which I'll address quickly:
  • The British monarchy, rather than a homegrown one, reigns as the main executive authority in the country though power is wielded by an appointed Governor-General.
  • Possible changes to provincial borders in the Northwest/Far North. Not really important overall.
  • A different party/PM list, starting in 1860 rather than 1785, due to the proposed POD at this point. I've got events after 1901 largely drafted out, but it's
So my question is this: through a combination of early armed successes and the implementation of a weakened version of the Galloway plan, the thirteen colonies remain part of British North America until at least the 1830s. How would Confederation, in a manner roughly similar to Canada or Australia in OTL, take place in this scenario? I'd imagine a few major hangups would be addressing the continuation of slavery, how indigenous tribes are handled, and westward expansion.

Now obviously, this would have long lasting implications on the broader world - the French Revolution could be neutered without the inspiration of the Americas (I could be wrong - not informed enough to make a educated guess) which could in turn hamper the Napoleonic Wars and the eventual British acquisition of the OTL Louisiana Territory. I have a basic chain of events in mind to address how the French/Spanish are booted out of Louisiana, but I definitely would like to flesh that out more.

I was thinking that the guarantees granted by London to the colonial legislatures that ensured their autonomy in the aftermath of the ATL (and failed) revolt in 1775 could result in slavery lasting into the 1860s, with Confederation being forced by the secession of the southern colonies into a state similar in nature to the CSA in OTL, more or less. This republican revolt threatens the remainder of the North American colonies enough to force the British to consolidate them much like OTL Canada in 1867. A war (the Great American War? or something like that) leads to the former southern colonies being brought into the fold by 1864-1865.

I guess the actual questions I have are the following:
  • Would London tolerate slavery lasting so long to begin with?
  • How would westward expansion play out with London in charge?
  • What happens to the Indigenous peoples? Do they still get pushed westward?
Is this a feasible path for a timeline? Am I misunderstanding the reasoning behind Canadian Confederation?

Any good links, ideas, or contributions are appreciated. I'm trying to get more meat on the bones here.
 
By far your biggest problem is that the British government, even one sympathetic to American colonists, is not going to allow the unification of colonies into a power bloc that will clearly rival Westminster. Any approach to be conciliatory to the colonists is going to focus on giving rights and powers to blocs that are will remain substantially smaller than GB itself. Given the sectional division that is inevitable post-1830ish, the Americans are not going to overcome this. Canadian Confederation only happened because Canada was a lot smaller than Britain and there was a powerful neighbour to worry about.

As for your questions. Britain is likely to face a big political divide. The anti-slavery sentiment of the country at large is going to be reflected in parliament once reform happens, likely between 1820 and 1835. Now some of that may be peeled off in the name of respecting promises of autonomy etc, but think the abolitionist push will be overwhelming by the 1850s, especially as the American North will be on their side (including the OTL Canadian colonies).

Westward expansion is likely to happen similar to Canada's. Much more regulated and planned, with something similar to the Canadian Mounted Police rather than OTL's Wild West. Natives are still likely to be treated terribly, especially those that can be cast as savages. However displacement is likely to be slower and those that become "civilized" and adopt British custom are likely to be excepted and held up as "proof" of Britain's civilizing mission.
 
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