The only impediment to a Nazi-Commie alliance was Stalin/Russian fixation on control of the Bosporus. Hitler's crushing victory at Dunkirk would convince Stalin to compromise on the issue. Once Turkey can't expect British help Turkey will readily cave in to German and Russian pressure, guarantee Soviets access to the Bosporus and give Soviets territorial concessions in the Caucasus in exchange for slices of Syrian territory.
Not so much. Stalin wanted territory - Baltic states, Moldavia, and he eyed Romania and Bulgaria. Otherwise kiss the CommuNazi alliance goodbye.
Once Hitler gets enough planes for air supremacy over Britain he will nuke the Soviets somewhere around 1948.
Not so much. It wasn't a nuke the Russians or the West was as afriad of. And besides, Germany lacked the factories to produce the quantity you're describing - B-17s et al will still pound German cities and factories like the fist of an angry god.
The British Empire ran on cheap Persian oil. The British didn't invade Iran just to transfer supplies to the Soviets but to secure control of their most profitable oil business venture to date. With control of the Persian Gulf the Soviets are going to be the main supplier of oil to the Axis and can charge a premium for it.
Mostly in the form of territory or sphere area after the war. Namely the Raj and Persia - on paper. Again, the Soviets on their own lack the logistical resources to pull off escapades like that.
The Germans would have the ME262 in 1945, which would wipe out obsolete British propeller driven planes. Speer estimated the Germans could have a nuke by 1947 if they devoted enough resources to it. At peace in 1942 Germany wouldn't have scuttled the nuke program and have the spare capacity to develop a nuclear weapon.
And the Jumo 004B has what, a 25-hour half-life? Maybe the 004D has a 35-hour half-life? Without a massive boost access to steel alloying materials their technology still has major problems in implementation. Never mind the BMW 018, BMW 028, or HeS 011. Have you also seen their later Me 262 designs and what they were proposing to do with the cockpit...?
The meteor isn't a match for the me-262 in 1945 and the US isn't turning Britain into airstrip one if the US is not at war.
US won't stand by while Russia, Germany, Italy, and Japan start uniting Eurasia and parts of Africa under one political alliance. They'll be in the war faster than OTL.
Britain is in a cold war with the Axis from 1941 to 1945 and no formal peace treaty is executed. Hitler wont turn east until the Brits are completely cowed. All sides are in an arms race. Britain keeps hoping for a Nazi -Soviet conflagration. Britain collapses in weeks in 1945 through shock and awe of the V2s and Me262s. The war is over before the US and Soviets can think of intervening. The Soviets marvel yet again at the invincible Wehrmacht. Germany gets the Brits nuke research.
V2s won't be enough and Me 262s won't be enough. Read about landings for the latter and failure rates for the former. It'll scare the UK certainly but they will not have been idle - look for Vampires to start showing up with Canada becoming a giant factory for the Allied war effort.