Coming from the high performance karting world, if I was going to try to adapt a set of pods to an EX, I'd start with a kart carb, and have a custom machined manifold. Alternatively, a rubber boot mount would work too...
I'd use a pulse-driven Tillotson , pulse driven off the crankcase. 34mm bore carbs.
I'd machine a manifold that had studs to mount the carb, and rotate the carbys to allow for easier needle access (ie. 30*)
Drive the diaphragms off crankcase pulse. No floats = less hassle, and adjustable jets simplifies tuning.
You'd have to work out how to sync the throttles. I'd use a single cable pull going to a "Y" rod that had r/c car turnbuckles for tuning. Sync as usual via vacuum.
The pods are simple, after that.
For the manifolds, it would be possible to 3D print a core, make an investment casting, and use that.
For a skilled homebrew guy, or a garage CNC'er, not too big a deal. Shoot, I may have to do it...
But for now, I'm happy doing the FOG mod.