A couple of factors to consider when talking about the German fleet is it size was controlled by the German Naval Laws. A key element was the age of replacement. 20 years for Battleships and Large Cruisers (BCs). So that huge mass of ships ordered as part of the first Fleet Law in 1898 is due for replacement. The Reichstag isn't going to be thrilled to pay for all that. Especially with the large number of war appropriation and replacements for war loss ships either under construction or at least on order.
So I can see a German government willing to do a deal to control costs and not have to build that huge mass of ships they are on hook for over next 5 years.
At same time fleet wants to revise the laws. With Tirpitz gone HSF can move to a unified type between the Large Cruiser and Battleship as some have been pushing for roughly a decade.
You could see a WNT analog as part of the peace treaty.
USA/UK/Ger/Jpn/Fra/Itl/AH
5/5/3/3/1.67/1.67:/1.67
Assuming that AH survives to sign such a treaty.
Question is UK willing to accept a German fleet 60% size of RN? In 1914 they were but would they be in 1918?
EDIT
Another thing to consider is that in 1918 Germany had second largest cruiser fleet and a mass of U Boats. Fear over trade will drive much of the British thinking about any naval deal with Germany. So the German light cruisers and U Boats will need to be included in any such deal.
Michael
The problem with an analogue of the WNT including Germany is manyfold:
1) the US will not accept to be second to anyone, hence their request that the japanese-british Alliance be dropped
2) if the Japanese are not their allies anymore and their are getting a 3 ratio, this combined with Germany's 3nand US 5 would out the RN at risk of being outnumbered
3) Japan is not going to accept anything less than a 3 ratio
4) the same applies to germany
5) even if the Germans accept 1,75 the problem would stay
6) the building holiday clause woul be untenable, ad the whole german battlefleet was obsolete, apart from the Bayern class
6b) no building holiday means a lot of money spent