I acknowledge that if the VTTs update to make it easy there will be no problem. I don't know how often they update for 3rd party products though so it isn't a given. It's a small consideration in the grand scheme of things and I don't want to derail the conversation further down this path, provably not worth bringing it up tbh.You are acting like they would not just update the how to dice reference linked all over roll20. You can't argue that people use it for d220k1/2d20d1 or whatever it is but couldn' t use it for the new thing too. Either the current advantage is subject to the same hassle you are thinking the new one would be or they are both exempt from it
I'd rather focus on the question of what to do with Advantage. My gut feel is that the 5/10 threshold feels less fun and is more fiddly than roll 2 keep highest.
On a radically different track, what if advantage was the only route to criticals? A nat 20 would no longer be a critical hit, but if you hit with both dice with Advantage it would be (a bit like the 3e roll to confirm). You would have more criticals and it would make applying Disadvantage on opposition more important to stop them getting the crits. Enemies with pack tactics would become terrifying.