How to you spectate a player with non-standard characters in their username

The server alias syntax is the same as on the client side. You can place aliases inside server.cfg or choose to separate them into their own file for the sake of neatness.

server.cfg

exec aliases.cfg

aliases.cfg

alias "meleeon" "sm_cvar sm_meleemode_enabled 1;sm_cvar example 0"
alias "meleeoff" "sm_cvar sm_meleemode_enabled 0;sm_cvar example 1"

You should also be able to change the default values of cvars registered in SourceMod plugins or have them vary by map. Just ask if that interests you.

I have hundred of hours play time with the Spy mostly using the classic knife and I was really interested to try the Conniver's Kunai as soon as it has been released.

Unfortunately, the 60 health points limit is really low and with the high level of missiles, pipes and bullets spam that there is in Team Fortress 2 it is really difficult to sneak behind the enemy lines without accidentally dying.

In the end I tested the Conniver a lot and found only a few maps and situations where its efficiency (K/D-ratio) is comparable to the standard knife. These are usually large maps, like, for example, pl_badwater (red team), cp_badlands and cp_coldfront when you are pushed by enemy team and mostly defending.