They do work, if you rotate them.
Praxis does not market them to work with the new exogram cranks, but they do work. See the difference? All you need to do is rotate the two chainrings a bit so that they are still oriented together/aligned but now match the crank arm hole pattern. You can file down the catch pin, it is really unnecessary but included "just because" - Adam has even mentioned somewhere that the length of that catch pin was made fairly standard and it can be filed down to make it fit for various arms.
Now, why are they not marketed to work? Because the whole Praxis concept is that with Levatime(tm), the chainrings have ramps and bits to perfectly engage your chain as you rotate the cranks with the most ideal situation of your power stroke in the rotation, and this is all based off of the traditional arm orientation that we've seen from past SRAM and Shimano, FSA, etc, crank arms. Technically speaking, the Levatime system will still work fine no matter what: if everything is rotated together, it will work. Will it work as absolutely perfectly to the utter millisecond that Praxis intended when they designed the chainrings? Maybe, maybe not, but the shifting is still phenomenal and you probably won't notice the difference. As a business it is not Praxis' intention to market that their product works when it isn't to the exact perfection that they intended - which, thankfully, Praxis is a very high-standard company. This also allows them to produce new sets of chainrings in the future which match the Exogram cranks (and, potentially, have an upcharge, but that's between them and your wallet to discuss). Marketing, look it up sometime.
So yes, you can use the current chainrings from Praxis with your Exogram cranks.
and for those of you still asking: READ THE THREAD!!! THIS WAS ALREADY COVERED IN THIS VERY THREAD!!! WHY ARE YOU ASKING QUESTIONS WHICH HAVE ALREADY BEEN ANSWERED IN THIS THREAD?? READ, PLEASE, READ!!!!!
That are the words I wanted to hear.