6 groups consisting of 4 teams. We're gonna have every team playing 3 matches in the group so there will be 6 (3+2+1) matches for every group, thus 36 matches overall in the group stage. The 12 first two teams from each group and the best four third placed teams will qualify to the 8Fs. So the elimination round will be 16 (8+4+2+1+1) matches (including the match for the third place). So overall, we'll have 52 (36+16) matches in the Olympics.
Now let's see how's the current format: two groups consisting of 6 teams. During the group stage there are 15 matches for each group, therefore 30 matches during the group stage. The elimination round is 8 matches (4+2+1+1) with including the third place match. So considering the current format there will be 38 matches, and in the suggested format it'll be 52.
So I don't see how it's "unrealistic" as you mentioned. 14 more matches wouldn't be so much that we can go as far as calling it impossible and unrealistic. The group stage can be done in one week and the other next week the elimination round begins. Doesn't sound like a tournament which makes plays exhausted, it's actually quite realistic with this format. The only thing is that the team's will play less matches in the group stage (from 5 to 3)
It's impossible. IOC would not allow more players to attend Olympics. Otherwise each team could have 14 players in Olympics already.