How about a generous German peace note to the Entente in the immediate aftermath of their Brest-Litovsk triumph - 1914 borders in the west with no monetary reparations by any parties, and an acknowledgement that the overseas colonies are gone and may be divided up between France, the UK and Belgium? Quid pro quo being that the western powers recognize Brest-Litovsk and German influence in eastern Europe.
Snowball's chance in hell?
If America hadn't joined the war then maybe the Entente would have taken it but it's by no means certain. They would think about it but I think they would still say no.
The French wanted Alsace Lorraine back and it still united all the parties in France and the British would want German naval power reduced.
IMO the Germans would have to inflict some defeats on the Western Front to make the Entente drop those demands.