Below is what I am thinking for the semis.
1. There won't be any reinforcements.
2. You will get all the players of the team you beat.
3. All semis would be two legged ties and both ties would be started at the same time on the same day so that the match time is still same.
4. You should have 5 outfield players from your team and 5 outfield players from your QF opponent's team for each tie. Each goalkeeper will start each tie.
5. No player can appear in both the ties.
6. The cumulative votes from both the ties would be used to determine the winner.
7. You will send a team and tactics for tie 1 and a team and tactics for tie 2.
8. No other restrictions on how you choose those 5 players
If there are any suggestions for changes, let me know and I can try to incorporate them.
Try not to dismiss the idea outright. Of course if enough people feel it's shit, I will fallback to usual snake reinforcements from losing teams.