I don’t know about the set-up from before including a paratrooper and bmr in the German set-up (sounds interesting though). I will say that you have the option of building a paratrooper and bmr on Germany’s first turn, and using them in the second impulse though.
I was under the impression that the Canadians and S African powers could build commando units as they share the builds on the combined set-up page w/UK. My understanding is that it would just count against the 6 commandos max (2 each turn) the UK can build in total. Plus you can play the Canadians & S Africans under the UK, and not as separate powers.
What they are lacking is an air base to allow them to take off from (even regular inf can’t bmr transport w/o AB), but an AB could be built (Canada should probably have an AB at set-up). Just for kicks you could walk your Canadian commando down to Washington and pair it w/a UK or Canadian built bomber to allow it to get airborne from the American AB, then on to the UK to be launched from one of the English AB’s (yeah, the more I think about it Canada should have an AB).
The FEC and Anz have their own individual limits for Commandos, but would not count against what could be built in Europe (UK, Canada, and S Africa collectively get 6 max). If you really think about it the Anz don’t have an AB either, so they would be in the same situation as the Canadians, but at least commandos also get a +1 for amphibs LOL. I also find it strange that Calcutta starts with an AB, but the FEC don’t get an air unit at set-up LOL.
Also if you are using Canada and S Africa as individual powers (they don’t get much income), I believe you are allowed to have the UK build units (including commandos) and place them directly into those countries IC’s (there are some limits). How the UK and all of its Commonwealth are played (Canada, S Africa, India, and Anz) is pretty much left up to you. IDK, but depending on how you’re playing, it might be possible for the UK to build an AB in one of its many commonwealth powers territories. By rule if Canada is played as its own power, the UK could build a couple units at the Canadian IC, could they also build them a 15 IPC AB? Would make sense that they would assist in building some of their infrastructure, but not sure about flipping the entire bill for a facility. Germany is allowed to built AB/NB in their minor axis powers territories though. If Canada wasn’t being played as a seperate power the UK would be able to build an AB there.