I think you are doing great job. Thank you for explanation and for putting your time into troubleshooting.
My opinion is that - if, as you described, changes are made not really often - it is better idea to do it when server administrators have time to do it, even if that is during FAF peak.
Some announcement on discord that there is some minor downtime expected should be enough.

Hello, my game crashed several times in TMM but it is not crashing in other games. I attach game log and an error message is posted below. Any suggestions?

EDIT: team games also are crashing

java.lang.RuntimeException: Forged Alliance Crashed with exit code -1073741819
at com.faforever.client.game.GameService.lambda$spawnTerminationListener$45(GameService.java:717)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:832)
game_14030569.log