No direct knowledge, no, but from what I pick up, the Saito gasser carbs are a weird mixture between a half Walbro and a glorified glow carb.
I have seen a few FG series engines run, and to be totally honest, they run absolutely OK, but no better than what I achieved with grinding the slot in the barrel of a conventional glow carb (the ones I did NOT mess up, I mean ). Only differrence is that grinding a carb can be a hit or miss affair and the Saito carbs are for certain usable.

Since the success or faillure of the solenoid system is 100% dependent on the curves determined by the end-user, of course solenoid fuel control also is not the be-all, end-all solution, but I am absolutely convinced that a Saito carb will never match a PROPERLY set fuel curve as can be achieved with the solenoid system.

So yeah, I am pretty sure that twin will be a good runner (the engine layout is not as tricky to master as their radials) and the carb will function without problems,
But where all my solenoid fitted engines have basically clear oil as only exhaust residue (it took me quite a bit of tweaking of the curve, I freely admit, and the engine has to be fully broken in as well), I do not expect smoke-free or crud-free exhausts with the Saito's, in fact would be highly amazed if they were.