Some people like to be condescending, don't take it personal.
Thats kind of the piston port curse, and part of the reason you don't see anything modern with piston port (expect for the A55 for some reason).
What I have found to be a good way to reduce the actual amount of mixture vomited back out of the carb is to make kind of like a J tube out of rubber. Then I drill a bunch of holes in it and wrap the whole thing (except the ends) in foam. I use UNI foam because I can get it around here for cheap, but even stuff like for lawnmowers from the hardware store will work, but might be a little more restrictive. Then I put a metal screen from a SHA on the far end and secured it there.
I can't tell you why it worked physics wise, but I think the fact that there is more surface area for the gas to evaporate from, the metal screen can't get soaked, and it can't really puke it all the way out fast enough with the bend in the J tube.
Also the velocity stack sounds reasonable and easy enough to implement.
Obviously if you had some way to fabricate up or machine in a reedvalve, that would be awesome. Its already a pretty tight squeeze in there though.