Welcome to the forums! Maximum radiator+fan thickness is 62mm, so push-pull isn't happening. Push-pull setups are generally quite inefficient in terms of space/cooling (a thicker radiator with one set of fans typically performs better compared to the volume needed), so there are very few SFF cases out there supporting them.
There ought to be room for a small pump somewhere, at least in the GPU compartment - standalone DDC pumps are quite compact after all. There's also options like Alphacool's DC-LT pumps if you want even smaller. For pump+block combos you have the Alphacool LT Solo (uses the aforementioned DC-LT pump) that's relatively cheap and widely available, but not very high performance, and custom offerings like the Nouvolo Aquanaut DDC pump-block combo that fits a DDC pump of your choice. There's also a Barrow DDC pump-block combo, though that's quite a bit taller than the Aquanaut.
There are also other cases you might want to consider (either available or upcoming) with 280mm rad support: the Dan C4, Cooler Master NR200, Winter One, Sliger SV590 (360mm) (and likely a bunch more that I can't remember right now).
Edit: got Barrow and Bykski mixed up