New Custom Gamemode Idea: Zombie Survival

I have an idea for an interesting gamemode for the random gamemode 2 week releases. Zombie Survival How it works: blind mode dominion: only except the last person on both teams cant choose, They are forced to play sion. at the beginning both teams spawn in bases as normal except for the 2 last picks. They spawn in the center instead of/inside storm shield. The 8 normal players start with normal gold at level 3, however the sions in middle start with no gold but instead storm shield, level 6, and 70% cooldown reduction. Their is no gold or xp gain throughout. after the shields drop the sions are still locked in for 30 seconds giving the survivors a chance to hide/run. After that both sions are released and attempt to kill all 8 other players. Any kill on sion incurs the usual respawn delay. However every sion kill results in the dead person to be converted to a sion with only zombie mode and level 3 stats/respawn delay.after 3 survivors are killed the sions lose the 70% cooldown reduction. after 4 survivors are killed the original sions are forced to zombie mode only as well but keep level 6 stats/permanent storm sheild. The zombie sions have no lifesteal or hp loss over time, and spawn with permanent oracles (nice try stealth champs). There will be a time limit for survivors to win. The towers can be captured for a massive hp boost to survivors and the normal hp/speed runes are active for everyone. This may be hard to code and a little confusing but thanks for reading