I think Toyota is full of crap here and doesn't tell us the full picture. I didn't notice that US dealers stopped receiving their allocations or that US members received the same QA problem message delaying their cars (if I'm wrong, US fellows are wholeheartedly welcomed to share their part of knowledge, thanks!

). Hard to believe that a QA problem with the car would be an EU specific issue.
The only activity that Toyota seems to engage in with great success so far, is to be the top contender for winning the title "Deliver the least amount of GR86 to Europe in favor of other markets".
So I have done my "research". I have been through hours of calls and dozens emails with pretty much all Toyota dealers in the EU. I will try and write down my observations in understandable way.
Toyota Europe is in the position of an importer with market specific demands such as FAP and headlight washers. These cars overall are not popular here, so that puts the importer in a bad position. Market specific demands with low volume. The Subaru plant will prefer the NA and the JP market when any shortage or disruptions occurs.
Toyota in Europe is divided into many regions, each country branch reports to their subdivison, subdivison reports to the Toyota Europe. Toyota Europe is the only entity here that can affect the whole process.
Example - Toyota CZ reports to Toyota CEE, Toyota CEE reports to Toyota Europe. So the dealer in the country is absolutely irrelevant in the big picture. Toyota CZ plays minimal role here as well, it is just a marketing/PR entity in that country. These small markets, such as Toyota CZ, are being pushed to do the "scarce" and "exclusivity" marketing/PR, otherwise Toyota CEE or Toyota Europe would not find your market profitable.
The situation is the same to the east of Germany, one salesman in the Baltics didn't even know that GR86 is a car.
Germany has many allocations but is specific due to the GR Center brand, which is being promoted hugely. Toyota dealers that are GR Center branded are not allowed to sell cars for export, in order to promote the GR brand and its "exclusivity". However, there are some Toyota dealers that are not GR branded and can get the GR86. Germany expects to have more allocations in the July 2022, delivery spring 2023.
Belgium, France and Luxembourg is the best bet. Many allocations, low demand, good MSRP. All dealers there, no exception, told me the estimated delivery is February 23. There was no info about exclusivity or limitations in Benelux and France, the only limitation is the safety regulation that will come to effect in June 2024.
Italy and Spain looked promising as well however I didn't push it further due to language barrier and distance.