I am aware of the Perry carbs, but those do not always fit ALL engines... And that is a bit my problem: IF I am going to try this, it needs to be affordable, AND it needs to be usable on ANY engine.
Otherwise it is better to buy a Saito FG series.
I mean, as it is now, a conversion costs the price of an ignition and roughly 60 bucks for the valve and associated stuff. That is doable, especially if there is allready an engine.
But if one has to buy a (used???) engine, an ignition, and the price of a throttle body, solenoid and electronics, the total cost is going to approach the price of a brand new gasser, and then it becomes pointless.

Something that COULD be an option, is to make valve housings with a threaded part that would fit into where the NVA screws into the carb body. It would maintain any possible airbleed or LS needle the carb allready has (solving the issues with idle stability), it would look "nearly the same" but again: not every manufacturer uses the same thread size for the NVA, and the absence of an orifice such as Chris and Rob use still would be a possible issue...