NY has UBC and if you follow the law as written, you can not even loan a shotgun to a friend to shoot clays without going to an FFL, then back again when they returns it. Obviously no one would do that, but that is how tight (stupid) they wrote the law. Gun shows guns were not allowed to be sold outside anymore but you could still bring them inside to sell without a booth but when you came in with a gun, even if you did not plan to sell it, you had paperwork to fill out and a tag was put on the gun. When you left you had to go through a check out where they would be sure the owner going out was still the owner or you had a tag that it had been transferred with onsite FFL.
Not sure where I originally heard the suggestion but it seems like with the current NICS system they have all the data to make a pass fail system where a phone call from anyone with a minimum of info, like last 4 of SSN and zip code or last name, they could quickly say yes or no. No paperwork needed, no gun information recorded, if the person failed and they thought there was a mistake, you could go to an FFL. Most honest gun sellers would probably make a free phone call to check a sale to an unknown person if no paperwork or $ were required. Dishonest gun sellers would not obey a UBC laws anyway. A plus/shortcut would be a carry permit could be an automatic approval.
I'm not naive I know the real purpose of UBC is to just make it a pain for gun ownership and a backdoor gun registry.