I don't think the Allies would have embarked on such an operation, if only for logistical reasons. The British were at the end of their thether, both economicaly and with regards manpower, the Russians had their own agenda on the Eastern side of Europe and the Americans where only interessted in Germany, or rather what financial and sientific gain they could get from the remains of the Third Reich. If you are designing bombs and rockets, your political stance is not important, only which side you are designing them for..... Talking about 'what if's', what if Germany would have been able to create the first A bomb...
Seeing that the war in the Pacific an S E Asia was still in full swing, the deployment of a large nummber of troops for what would have been a pointless attack on a harmless country, albeit one with an unsavoury leader ( hmmm, rings a bell..), seems very unlikely.
The following statement is in no way meant to be a slur on the americans who fought to give us back or freedom. It comes forth from the hesitancy of the American governments to join or intervere the war untill the trade seemed to be threatened. I don't know if the American involvement in Europa after the war (NATO) was based on a genuiene desire to help Europe to live in peace, I sincerely hope so, or a calculated way of asuring that the Lend-lease repayments from the allies would not be jeopardised. I don't think Western Europe ruled by Russia would have made many repayments.
Cheers
Henk