There’s not many ground units in E Poland to start with (3 inf, 1 art). I haven’t seen a game that W Poland and Warsaw doesn’t fall on G1 to preserve Polish ground forces or ftr, so there has been no way to add more ground troops to Poland that I can see (unless you bmr transport an inf over from London and leave bmr there too). Russia is only allowed to attack Poland, they can’t NCM in to reinforce allied positions (at this point). If the Germans really take a beating taking W Pol & Warsaw, and would be risking the Luftwaffe to attack E Pol G2 then maybe move over the the RAF, but it still seems like you could be sacrificing any air units sent in (would be situational IMO).
In our games (W Pol & Warsaw falls G1) Germany generally buys a bmr or two G1 to help finish off the Royal Navy, and to start moving around inf later (fly inf to Egypt for bonus, or perform para drops). So the bmrs we see them buy G1 every game so far, and left over Warsaw troops would finish off E Pol, along with much of the RAF if placed there IMO. Plus Germany would gain the 2 IPCs for E Pol, and deny it to the Russians (Russia doesn’t get much income early on). Russia has the strength to knock out E Pol rather easily R1, and their units can generally retreat R2 before the Germans attack normally on G3 or G4 in our games (depending on how Russia is rolling their war dice).
I know we have discussed early UK landings in the Balkans in conjunction with making a stance in Poland to overload the axis, but I’m not sure how many units (expensive air and sea units) the UK can place in harms way before they get their clocks cleaned, or are looking at a Sea Lion. The UK needs the RAF to survive, not lose it in Poland IMO. However if the Germans are lacking the ground units and/or the Luftwaffe is out of position to aid in the attack you might consider a temporary stand in E Poland (keep the axis tied up, and away from other goals). It could also allow your ftrs to get to the Balkans UK2 or even to a carrier in sz42, then on to N Africa/Med (would be risky)?
If Warsaw doesn’t fall for some reason on G1 then all bets are off. Russia should not hit E Poland so that on UK’s first turn those units can go to Warsaw to set-up a def stance (along w/RAF). I believe by rule (2nd option, UK takes full control) the UK could build units in Warsaw’s minor IC UK1. UK would gain ownership of the Warsaw IC right after Germany’s turn, allowing them to build there on UK1 as they would own it before their turn started IMO. If you use option 1 (Poland as its own econ/power), Poland wouldn’t be able to build units in the first turn because it has no starting IPCs, but if it was viewed as a Commonwealth Power at that point then I believe the UK could still build units in the Warsaw IC as it can in any of the Commonwealth ICs.
**Question for Variable if Germany fails to capture Warsaw in option 1 (Poland has separate econ) is Poland and the Warsaw IC viewed as being a Commonwealth Power allowing the UK to build there directly in the event Warsaw isn’t captured G1.