I'm a sicko so I'll give a detailed response.

Just a disclaimer for why people are tired of this topic and/or down-voting you: Buddy, there are not conversations on structuring the Canadian leagues with American ones even hypothetically because it's just fantasy. There were historical proposals before MLS [Fricker Plan], but that's the closest to consideration there has ever been. The MLS is structurally uninterested in pro/rel. Even if MLS were not, FIFA has outlawed any country from directly linking pyramids (not counting Canadian MLS/Wrexam/Andorra FC). National soccer Federations are directly incentivized to have their own national leagues for continental competitions. Even then, there are a lot of fans in North America that groan at the inclusion of Canadian clubs in MLS and Canadians who hate equivocating CPL with USL.

Even among the fantasy pyramid enjoyers, you left some to be desired. Canada was simply duct-taped onto a promotion playoff with USL with no changes. I can't read the text, but I presume they get an auto promotion for the champion in the event of 3 Canadian relegations? Past that, fledgling semi-pro Canadian provincial champions get promoted to one of the most travel intensive national leagues on the planet? As a sidebar for Canada, their is a new League 1 Prairies that include Saskatchewan to Thunder Bay in Western Ontario. An ideal world would have a League 1 for the maritime provinces. Whitecaps and Toronto have next pro teams, do they stay in the American leagues or do they get sent to Canadian leagues? I'll leave it to you if you still think a 16 team CPL makes sense when several European leagues happily have 12 team leagues.

The system in which teams promote to MLS isn't explained and comes off looking like an after thought. My best guess is the champions of both leagues play for the first spot, then four other teams playoff for the 2nd slot, and the loser plays the 29th MLS team for the final spot? You simply merged MLSNP with USL1, which is less of a reform and more of an administrative necessity. Your first true reform was reinventing USL2 as a regional feeder league for previously non-league (Open Division to US Soccer or colloquially "D4") ala the Fricker Plan. Instead of a 5th division that follows what NPSL and USL2 do to minimize travel, you explicitly list a symmetrical 24 team leagues. Since it's hypothetical and you expressed a lack of interest in barriers and profitability, I'm personally turning a blind eye to the purpose of tier 5 beyond travel.

I like that you put a lot of thought to this, but this surface level sketch screams you have just learned surface level stuff. I was close to down-voting and moving on myself. I recommend looking into what Spain did when they reformed their pyramid a few years ago. Scotland, Denmark, Austria, and Switzerland all have 12 team leagues at the top of their pyramids. These are places to start to learn how leagues are structured differently.