I like all of these ideas in theory. The problem is EG can go 1 of 2 ways. Either you have a very successful run, where you're closing good quickly and it's enjoyable. OR you have a bunch of people tainting goods and running up wait times, and EG becomes a monotonous slog fest.
If all the games were like the first scenario then those ideas would be a fun twist. But if they're like the 2nd scenario, then they become even less fun than a normal EG.