Can't Germany use its new found hegomeny to still force everyone to trade with it, seeing as its coming from a position of power?
They can threaten France or Poland with renewed hostilities. This undermines once again your premise of limited warfare.
The Dutch may be susceptible to pressure, if they don't choose to join the anti-German block. The Scandinavians will have flocked to British proteciton, and the Belgians to French.
The one area where political and diplomatic pressure, and frankly straight saber-rattling, can have effect is the Balkans, but there the Germans will face, as I mentioned, diplomatic and economic competition of the French and Italians (for instance in Romania), of the Italians (in Hungary), of the British (in Greece) and the Soviets (in Bulgaria). If the USA can and want to throw their weight around, it won't be in favor of German companies. That essentially leaves Yugoslavia. I doubt the Dutch and the Yugoslavs will be enough as trade partners.
Plus, in the event of a sort of ww3, Germanny will be playing on the defensive this time, so it can fortify its new borders and bleeed the coalition dry.
Are you reading what I write? I told you Germany will find it difficult to buy enough food abroad
in peacetime. Let alone enough food from abroad in wartime. Or any foreign strategic raw materials. Where will the oil come from, for instance? The Romanian one will be outbought by the USA (which anyway owned part of the concerns in Ploesti) and hindered by the French, the British and the Italians. South American oil can't arrive because the Royal Navy is blockading. Soviet oil won't arrive because the SU isn't selling, and in any case, the Poles wouldn't let it get through.
Note that your scenario also further damages the chances of peaceful trade for Germany, because you have made sure they have to remain on a war footing. They won't be able to produce many radios and cuckoo clocks and cameras for export, because the factories producing those things will still be producing similar equipment for the Wehrmacht. They can't sell good German steel abroad, because they're using it for your fortifications. They can't sell chemical products or related hardware, because they need it all for producing in those costly plants the synthetic oil and rubber they can't buy abroad, and also because the chemicals go into the ammunition. In particular, they'll be producing less fertilizers than they need, because the stuff is the same that goes into making explosives, and they have to keep making those to remain in arms. Which means even less internal food production.
So even if the Germans found someone willing to sell them food, oil, iron ore, aluminium, rubber, tungsten and whatnot, they would have very little to sell.