Not a chance. There are currently no examples where Canadian border officers operate in other countries. This differs from the US where officers do pre-clearance in places like Canada, Aruba and Ireland. AFAIK, provision was made for a Canadian "office" in the Niagara Falls, NY, Amtrak station, however this never materialized due to "union" issues - long before a pandemic made it all academic. I'm not even sure whether the US would permit "foreign" officers to operate on US soil, but the issues run much deeper than that.
I don't get it what the Canadian authorities consider as the problem.
Is the difference between Canada and the US that big? Is it because of the huge amount of weapons Canadian authorities are afraid they could come to Canada from the US? Perhaps a little bit off topic, I'm just wondering.
In Switzerland, there are multiple trains arriving and leaving everyday to/from Germany, Austria, Liechtenstein, Italy and France. Border controls either happen in trains or you arrive in a sort of check-point when you try to exit a border train station. But it would not be an option to just deny entry or departure of trains because of anything concerning border patrols, at least not in Western Europe.
How long have I been advocating for that? There's only 60 miles of track to fix up between Dearborn and Toledo. The track from Dearborn to Porter, Indiana is passenger-operator-controlled track, avoiding NS-caused delays. There's enough room in the ROW from Toledo to Detroit to have a passenger-controlled track (there are currently four tracks plus vacant land on the direct route, and alternate ROWs, too). If South of the Lake ever gets funded for the Chicago approach, as it should, we could have a passenger-operator-controlled route from Chicago Union all the way to Toledo....
Anyway, in the Canada department, what we might see is the reopening of Detroit Michigan Central Station, customs at that location, a Detroit - Toronto train operated by VIA, and a Chicago-Detroit Michigan Central train.
I agree with you.
Without the border control issues, Detroit - Toronto could have a big potential in my eyes. I'm excited about Amtrak and the Detroit River tunnel. Additionnally thanks to the acquistion of the Detroit River Tunnel will bring re-use of the wonderful Detroit Michigan Central Station into consideration. Having Michigan Central Station as a new old Amtrak station could draw more interest from tourists perhaps just because of the fame of the old station.
As I mentioned before, I would, like you, also consider Detroit - Toledo more seriously, as infrastructure seems largely to be there already. Perhaps the state of Michigan could acquire a complete line from the freight companies to secure a reliable access, like it was the case with other routes in Michigan (if I'm not wrong). Then you could go from Detroit to Cleveland by train again. Would be great.
Here's an article about the acquisition of the Detroit River Tunnel:
Cross-border rail tunnel passenger service moves step closer
I don't know how close or realistical passenger service between Detroit and Canada is, but I doubt Amtrak would reach agreements if they don't intend to use it.
What is positive to is that CP seems willing to work together with Amtrak, in contrast to the juristical fights ongoing between Amtrak and freight companies in the Southern Gulf east of New Orleans.